Title: [236138] trunk/Source/WebKit
Revision
236138
Author
[email protected]
Date
2018-09-18 08:41:31 -0700 (Tue, 18 Sep 2018)

Log Message

REGRESSION (PSON): White or Black flash occurs when process swapping on navigation on Mac
https://bugs.webkit.org/show_bug.cgi?id=189663
<rdar://problem/44184955>

Reviewed by Geoff Garen.

We need to keep the layer tree of the previous page alive and visible until we have something
to render on the new page. With PSON on Mac this means that we should keep displaying the
layer tree from the previus process.

This patch moves the management of 'attaching' the drawing area (Mac only concept) from web process
to UI process. This is when we parent the layer tree to the view root layer. It also ensures that
the layer tree is not deleted too early on process swap and that it still eventually gets deleted.

* UIProcess/DrawingAreaProxy.h:
(WebKit::DrawingAreaProxy::attachInWebProcess):
* UIProcess/SuspendedPageProxy.cpp:
(WebKit::messageNamesToIgnoreWhileSuspended):
(WebKit::SuspendedPageProxy::tearDownDrawingAreaInWebProcess):

We no longer tear down drawing area (layer tree) for suspended pages automatically. Send an explicit
message for it.

* UIProcess/SuspendedPageProxy.h:
* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::reattachToWebProcess):

Only call didRelaunchProcess when process actually relaunched (not navigation process launch) to
match not calling processDidExit in resetStateAfterProcessExited.

(WebKit::WebPageProxy::didCompletePageTransition):

Attach the drawing area if appropriate.

(WebKit::WebPageProxy::decidePolicyForNavigationAction):

Send suspend message to WebPage immediately instead waiting for the runloop callback. This is needed so we
can avoid flashing the initial empty document load when the new Page object is created.

(WebKit::WebPageProxy::resetStateAfterProcessExited):

Don't call processDidExit when suspending, not exiting the process (this function needs a new name or rafactoring).
This avoids clearing the drawing area and flashing to black.

(WebKit::WebPageProxy::enterAcceleratedCompositingMode):

This is called when we have switched to the new layer tree.
Tear down the drawing area in the previus process.

* UIProcess/WebPageProxy.h:
* UIProcess/WebPageProxy.messages.in:
* UIProcess/mac/TiledCoreAnimationDrawingAreaProxy.h:
* UIProcess/mac/TiledCoreAnimationDrawingAreaProxy.mm:
(WebKit::TiledCoreAnimationDrawingAreaProxy::attachInWebProcess):

Send a message to the web process to attach the drawing area.

* WebProcess/WebPage/DrawingArea.h:
(WebKit::DrawingArea::attach):
(WebKit::DrawingArea::attachDrawingArea): Deleted.

Rename to be less redundant.

* WebProcess/WebPage/DrawingArea.messages.in:
* WebProcess/WebPage/WebPage.cpp:
(WebKit::WebPage::reinitializeWebPage):

Don't attach drawing area automatically. It will be done by a message from UI process.

(WebKit::WebPage::setLayerTreeStateIsFrozen):

Layer tree is always frozen in a suspended process (if it exists).

(WebKit::WebPage::didStartPageTransition):
(WebKit::WebPage::didCompletePageTransition):

Notify UI process of transition completion.

(WebKit::WebPage::setIsSuspended):
(WebKit::WebPage::tearDownDrawingAreaForSuspend):
* WebProcess/WebPage/WebPage.h:
* WebProcess/WebPage/WebPage.messages.in:
* WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.h:
* WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.mm:
(WebKit::TiledCoreAnimationDrawingArea::TiledCoreAnimationDrawingArea):

Don't attach drawing area automatically. It will be done by a message from UI process.

(WebKit::TiledCoreAnimationDrawingArea::attach):
(WebKit::TiledCoreAnimationDrawingArea::attachDrawingArea): Deleted.

Modified Paths

Diff

Modified: trunk/Source/WebKit/ChangeLog (236137 => 236138)


--- trunk/Source/WebKit/ChangeLog	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/ChangeLog	2018-09-18 15:41:31 UTC (rev 236138)
@@ -1,3 +1,96 @@
+2018-09-18  Antti Koivisto  <[email protected]>
+
+        REGRESSION (PSON): White or Black flash occurs when process swapping on navigation on Mac
+        https://bugs.webkit.org/show_bug.cgi?id=189663
+        <rdar://problem/44184955>
+
+        Reviewed by Geoff Garen.
+
+        We need to keep the layer tree of the previous page alive and visible until we have something
+        to render on the new page. With PSON on Mac this means that we should keep displaying the
+        layer tree from the previus process.
+
+        This patch moves the management of 'attaching' the drawing area (Mac only concept) from web process
+        to UI process. This is when we parent the layer tree to the view root layer. It also ensures that
+        the layer tree is not deleted too early on process swap and that it still eventually gets deleted.
+
+        * UIProcess/DrawingAreaProxy.h:
+        (WebKit::DrawingAreaProxy::attachInWebProcess):
+        * UIProcess/SuspendedPageProxy.cpp:
+        (WebKit::messageNamesToIgnoreWhileSuspended):
+        (WebKit::SuspendedPageProxy::tearDownDrawingAreaInWebProcess):
+
+        We no longer tear down drawing area (layer tree) for suspended pages automatically. Send an explicit
+        message for it.
+
+        * UIProcess/SuspendedPageProxy.h:
+        * UIProcess/WebPageProxy.cpp:
+        (WebKit::WebPageProxy::reattachToWebProcess):
+
+        Only call didRelaunchProcess when process actually relaunched (not navigation process launch) to
+        match not calling processDidExit in resetStateAfterProcessExited.
+
+        (WebKit::WebPageProxy::didCompletePageTransition):
+
+        Attach the drawing area if appropriate.
+
+        (WebKit::WebPageProxy::decidePolicyForNavigationAction):
+
+        Send suspend message to WebPage immediately instead waiting for the runloop callback. This is needed so we
+        can avoid flashing the initial empty document load when the new Page object is created.
+
+        (WebKit::WebPageProxy::resetStateAfterProcessExited):
+
+        Don't call processDidExit when suspending, not exiting the process (this function needs a new name or rafactoring).
+        This avoids clearing the drawing area and flashing to black.
+
+        (WebKit::WebPageProxy::enterAcceleratedCompositingMode):
+
+        This is called when we have switched to the new layer tree.
+        Tear down the drawing area in the previus process.
+
+        * UIProcess/WebPageProxy.h:
+        * UIProcess/WebPageProxy.messages.in:
+        * UIProcess/mac/TiledCoreAnimationDrawingAreaProxy.h:
+        * UIProcess/mac/TiledCoreAnimationDrawingAreaProxy.mm:
+        (WebKit::TiledCoreAnimationDrawingAreaProxy::attachInWebProcess):
+
+        Send a message to the web process to attach the drawing area.
+
+        * WebProcess/WebPage/DrawingArea.h:
+        (WebKit::DrawingArea::attach):
+        (WebKit::DrawingArea::attachDrawingArea): Deleted.
+
+        Rename to be less redundant.
+
+        * WebProcess/WebPage/DrawingArea.messages.in:
+        * WebProcess/WebPage/WebPage.cpp:
+        (WebKit::WebPage::reinitializeWebPage):
+
+        Don't attach drawing area automatically. It will be done by a message from UI process.
+
+        (WebKit::WebPage::setLayerTreeStateIsFrozen):
+
+        Layer tree is always frozen in a suspended process (if it exists).
+
+        (WebKit::WebPage::didStartPageTransition):
+        (WebKit::WebPage::didCompletePageTransition):
+
+        Notify UI process of transition completion.
+
+        (WebKit::WebPage::setIsSuspended):
+        (WebKit::WebPage::tearDownDrawingAreaForSuspend):
+        * WebProcess/WebPage/WebPage.h:
+        * WebProcess/WebPage/WebPage.messages.in:
+        * WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.h:
+        * WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.mm:
+        (WebKit::TiledCoreAnimationDrawingArea::TiledCoreAnimationDrawingArea):
+
+        Don't attach drawing area automatically. It will be done by a message from UI process.
+
+        (WebKit::TiledCoreAnimationDrawingArea::attach):
+        (WebKit::TiledCoreAnimationDrawingArea::attachDrawingArea): Deleted.
+
 2018-09-18  Claudio Saavedra  <[email protected]>
 
         [WPE] Implement mouse event modifiers

Modified: trunk/Source/WebKit/UIProcess/DrawingAreaProxy.h (236137 => 236138)


--- trunk/Source/WebKit/UIProcess/DrawingAreaProxy.h	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/UIProcess/DrawingAreaProxy.h	2018-09-18 15:41:31 UTC (rev 236138)
@@ -82,6 +82,8 @@
     void viewExposedRectChangedTimerFired();
 #endif
 
+    virtual void attachInWebProcess() { }
+
     virtual void updateDebugIndicator() { }
 
     virtual void waitForDidUpdateActivityState(ActivityStateChangeID) { }

Modified: trunk/Source/WebKit/UIProcess/SuspendedPageProxy.cpp (236137 => 236138)


--- trunk/Source/WebKit/UIProcess/SuspendedPageProxy.cpp	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/UIProcess/SuspendedPageProxy.cpp	2018-09-18 15:41:31 UTC (rev 236138)
@@ -54,6 +54,7 @@
         messageNames.get().add("DidDestroyNavigation");
         messageNames.get().add("DidFinishDocumentLoadForFrame");
         messageNames.get().add("DidFinishProgress");
+        messageNames.get().add("DidCompletePageTransition");
         messageNames.get().add("DidFirstLayoutForFrame");
         messageNames.get().add("DidFirstVisuallyNonEmptyLayoutForFrame");
         messageNames.get().add("DidNavigateWithNavigationData");
@@ -109,6 +110,11 @@
     m_page.suspendedPageClosed(*this);
 }
 
+void SuspendedPageProxy::tearDownDrawingAreaInWebProcess()
+{
+    m_process->send(Messages::WebPage::TearDownDrawingAreaForSuspend(), m_page.pageID());
+}
+
 void SuspendedPageProxy::didFinishLoad()
 {
     ASSERT(m_process);

Modified: trunk/Source/WebKit/UIProcess/SuspendedPageProxy.h (236137 => 236138)


--- trunk/Source/WebKit/UIProcess/SuspendedPageProxy.h	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/UIProcess/SuspendedPageProxy.h	2018-09-18 15:41:31 UTC (rev 236138)
@@ -49,6 +49,7 @@
 
     void webProcessDidClose(WebProcessProxy&);
     void destroyWebPageInWebProcess();
+    void tearDownDrawingAreaInWebProcess();
 
 #if !LOG_DISABLED
     const char* loggingString() const;

Modified: trunk/Source/WebKit/UIProcess/WebPageProxy.cpp (236137 => 236138)


--- trunk/Source/WebKit/UIProcess/WebPageProxy.cpp	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/UIProcess/WebPageProxy.cpp	2018-09-18 15:41:31 UTC (rev 236138)
@@ -56,8 +56,8 @@
 #include "AuthenticationDecisionListener.h"
 #include "DataReference.h"
 #include "DownloadProxy.h"
+#include "DrawingAreaMessages.h"
 #include "DrawingAreaProxy.h"
-#include "DrawingAreaProxyMessages.h"
 #include "EventDispatcherMessages.h"
 #include "FrameInfoData.h"
 #include "LoadParameters.h"
@@ -798,7 +798,9 @@
 
     initializeWebPage();
 
-    pageClient().didRelaunchProcess();
+    if (!navigation)
+        pageClient().didRelaunchProcess();
+
     m_drawingArea->waitForBackingStoreUpdateOnNextPaint();
 }
 
@@ -2449,6 +2451,8 @@
         if (proposedProcess.ptr() != &process()) {
             RELEASE_LOG_IF_ALLOWED(ProcessSwapping, "%p - WebPageProxy::decidePolicyForNavigationAction, swapping process %i with process %i for navigation, reason: %{public}s", this, processIdentifier(), proposedProcess->processIdentifier(), reason.utf8().data());
             LOG(ProcessSwapping, "(ProcessSwapping) Switching from process %i to new process (%i) for navigation %" PRIu64 " '%s'", processIdentifier(), proposedProcess->processIdentifier(), navigation->navigationID(), navigation->loggingString());
+
+            process().send(Messages::WebPage::SetIsSuspended(true), pageID());
             
             RunLoop::main().dispatch([this, protectedThis = makeRef(*this), navigation = makeRef(*navigation), proposedProcess = WTFMove(proposedProcess)]() mutable {
                 continueNavigationInNewProcess(navigation, WTFMove(proposedProcess));
@@ -3445,6 +3449,22 @@
     m_pageLoadState.commitChanges();
 }
 
+void WebPageProxy::didCompletePageTransition(bool isInitialEmptyDocument)
+{
+#if PLATFORM(MAC)
+    if (!m_drawingArea)
+        return;
+
+    // Attach drawing area for the initial empty document only if this is not a process swap.
+    if (isInitialEmptyDocument && m_suspendedPage)
+        return;
+
+    m_drawingArea->attachInWebProcess();
+#else
+    UNUSED_PARAM(isInitialEmptyDocument);
+#endif
+}
+
 void WebPageProxy::setNetworkRequestsInProgress(bool networkRequestsInProgress)
 {
     auto transaction = m_pageLoadState.transaction();
@@ -6167,7 +6187,9 @@
 
     m_editorState = EditorState();
 
-    pageClient().processDidExit();
+    if (terminationReason != ProcessTerminationReason::NavigationSwap)
+        pageClient().processDidExit();
+
     pageClient().clearAllEditCommands();
 
     auto resetStateReason = terminationReason == ProcessTerminationReason::NavigationSwap ? ResetStateReason::NavigationSwap : ResetStateReason::WebProcessExited;
@@ -6308,6 +6330,10 @@
 void WebPageProxy::enterAcceleratedCompositingMode(const LayerTreeContext& layerTreeContext)
 {
     pageClient().enterAcceleratedCompositingMode(layerTreeContext);
+
+    // We have completed the page transition and can tear down the layers in the suspended process.
+    if (m_suspendedPage)
+        m_suspendedPage->tearDownDrawingAreaInWebProcess();
 }
 
 void WebPageProxy::exitAcceleratedCompositingMode()

Modified: trunk/Source/WebKit/UIProcess/WebPageProxy.h (236137 => 236138)


--- trunk/Source/WebKit/UIProcess/WebPageProxy.h	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/UIProcess/WebPageProxy.h	2018-09-18 15:41:31 UTC (rev 236138)
@@ -1423,6 +1423,7 @@
     void didStartProgress();
     void didChangeProgress(double);
     void didFinishProgress();
+    void didCompletePageTransition(bool isInitialEmptyDocument);
     void setNetworkRequestsInProgress(bool);
 
     void hasInsecureContent(WebCore::HasInsecureContent&);

Modified: trunk/Source/WebKit/UIProcess/WebPageProxy.messages.in (236137 => 236138)


--- trunk/Source/WebKit/UIProcess/WebPageProxy.messages.in	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/UIProcess/WebPageProxy.messages.in	2018-09-18 15:41:31 UTC (rev 236138)
@@ -117,6 +117,8 @@
     DidFinishProgress()
     DidStartProgress()
 
+    DidCompletePageTransition(bool isInitialEmptyDocument)
+
     SetNetworkRequestsInProgress(bool networkRequestsInProgress)
 
     # Frame lifetime messages

Modified: trunk/Source/WebKit/UIProcess/mac/TiledCoreAnimationDrawingAreaProxy.h (236137 => 236138)


--- trunk/Source/WebKit/UIProcess/mac/TiledCoreAnimationDrawingAreaProxy.h	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/UIProcess/mac/TiledCoreAnimationDrawingAreaProxy.h	2018-09-18 15:41:31 UTC (rev 236138)
@@ -38,6 +38,8 @@
 
 private:
     // DrawingAreaProxy
+    void attachInWebProcess() override;
+
     void deviceScaleFactorDidChange() override;
     void sizeDidChange() override;
     void colorSpaceDidChange() override;

Modified: trunk/Source/WebKit/UIProcess/mac/TiledCoreAnimationDrawingAreaProxy.mm (236137 => 236138)


--- trunk/Source/WebKit/UIProcess/mac/TiledCoreAnimationDrawingAreaProxy.mm	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/UIProcess/mac/TiledCoreAnimationDrawingAreaProxy.mm	2018-09-18 15:41:31 UTC (rev 236138)
@@ -53,6 +53,11 @@
     m_callbacks.invalidate(CallbackBase::Error::OwnerWasInvalidated);
 }
 
+void TiledCoreAnimationDrawingAreaProxy::attachInWebProcess()
+{
+    m_webPageProxy.process().send(Messages::DrawingArea::Attach(), m_webPageProxy.pageID());
+}
+
 void TiledCoreAnimationDrawingAreaProxy::deviceScaleFactorDidChange()
 {
     m_webPageProxy.process().send(Messages::DrawingArea::SetDeviceScaleFactor(m_webPageProxy.deviceScaleFactor()), m_webPageProxy.pageID());

Modified: trunk/Source/WebKit/WebProcess/WebPage/DrawingArea.h (236137 => 236138)


--- trunk/Source/WebKit/WebProcess/WebPage/DrawingArea.h	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/WebProcess/WebPage/DrawingArea.h	2018-09-18 15:41:31 UTC (rev 236138)
@@ -151,7 +151,7 @@
     void displayWasRefreshed();
 #endif
 
-    virtual void attachDrawingArea() { };
+    virtual void attach() { };
 
 protected:
     DrawingArea(DrawingAreaType, WebPage&);

Modified: trunk/Source/WebKit/WebProcess/WebPage/DrawingArea.messages.in (236137 => 236138)


--- trunk/Source/WebKit/WebProcess/WebPage/DrawingArea.messages.in	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/WebProcess/WebPage/DrawingArea.messages.in	2018-09-18 15:41:31 UTC (rev 236138)
@@ -45,7 +45,11 @@
     DestroyNativeSurfaceHandleForCompositing() -> (bool handled)
 #endif
 
-#if PLATFORM(MAC) && ENABLE(WEBPROCESS_WINDOWSERVER_BLOCKING)
+#if PLATFORM(MAC)
+    Attach()
+
+#if ENABLE(WEBPROCESS_WINDOWSERVER_BLOCKING)
     DisplayWasRefreshed()
 #endif
+#endif
 }

Modified: trunk/Source/WebKit/WebProcess/WebPage/WebPage.cpp (236137 => 236138)


--- trunk/Source/WebKit/WebProcess/WebPage/WebPage.cpp	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/WebProcess/WebPage/WebPage.cpp	2018-09-18 15:41:31 UTC (rev 236138)
@@ -657,7 +657,6 @@
         m_drawingArea->updatePreferences(parameters.store);
         m_drawingArea->setPaintingEnabled(true);
     }
-    m_drawingArea->attachDrawingArea();
 
     if (m_activityState != parameters.activityState)
         setActivityState(parameters.activityState, ActivityStateChangeAsynchronous, Vector<CallbackID>());
@@ -2215,7 +2214,7 @@
     if (!drawingArea)
         return;
 
-    drawingArea->setLayerTreeStateIsFrozen(frozen);
+    drawingArea->setLayerTreeStateIsFrozen(frozen || m_isSuspended);
 }
 
 void WebPage::callVolatilityCompletionHandlers(bool succeeded)
@@ -2846,7 +2845,7 @@
 
 void WebPage::didStartPageTransition()
 {
-    m_drawingArea->setLayerTreeStateIsFrozen(true);
+    setLayerTreeStateIsFrozen(true);
 
 #if PLATFORM(MAC)
     bool hasPreviouslyFocusedDueToUserInteraction = m_hasEverFocusedElementDueToUserInteractionSincePageTransition;
@@ -2870,8 +2869,11 @@
 
 void WebPage::didCompletePageTransition()
 {
-    if (m_drawingArea)
-        m_drawingArea->setLayerTreeStateIsFrozen(false);
+    // FIXME: Layer tree freezing should be managed entirely in the UI process side.
+    setLayerTreeStateIsFrozen(false);
+
+    bool isInitialEmptyDocument = !m_mainFrame;
+    send(Messages::WebPageProxy::DidCompletePageTransition(isInitialEmptyDocument));
 }
 
 void WebPage::show()
@@ -6000,10 +6002,22 @@
         return;
 
     m_isSuspended = suspended;
-    if (m_isSuspended)
-        m_drawingArea = nullptr;
+
+#if PLATFORM(MAC)
+    // Drawing area is cleared by a message from the UI process.
+    setLayerTreeStateIsFrozen(true);
+#else
+    tearDownDrawingAreaForSuspend();
+#endif
 }
 
+void WebPage::tearDownDrawingAreaForSuspend()
+{
+    if (!m_isSuspended)
+        return;
+    m_drawingArea = nullptr;
+}
+
 void WebPage::frameBecameRemote(uint64_t frameID, GlobalFrameIdentifier&& remoteFrameIdentifier, GlobalWindowIdentifier&& remoteWindowIdentifier)
 {
     RefPtr<WebFrame> frame = WebProcess::singleton().webFrame(frameID);

Modified: trunk/Source/WebKit/WebProcess/WebPage/WebPage.h (236137 => 236138)


--- trunk/Source/WebKit/WebProcess/WebPage/WebPage.h	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/WebProcess/WebPage/WebPage.h	2018-09-18 15:41:31 UTC (rev 236138)
@@ -1414,6 +1414,7 @@
     void urlSchemeTaskDidComplete(uint64_t handlerIdentifier, uint64_t taskIdentifier, const WebCore::ResourceError&);
 
     void setIsSuspended(bool);
+    void tearDownDrawingAreaForSuspend();
 
     RefPtr<WebImage> snapshotAtSize(const WebCore::IntRect&, const WebCore::IntSize& bitmapSize, SnapshotOptions);
     RefPtr<WebImage> snapshotNode(WebCore::Node&, SnapshotOptions, unsigned maximumPixelCount = std::numeric_limits<unsigned>::max());

Modified: trunk/Source/WebKit/WebProcess/WebPage/WebPage.messages.in (236137 => 236138)


--- trunk/Source/WebKit/WebProcess/WebPage/WebPage.messages.in	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/WebProcess/WebPage/WebPage.messages.in	2018-09-18 15:41:31 UTC (rev 236138)
@@ -506,6 +506,7 @@
     URLSchemeTaskDidComplete(uint64_t handlerIdentifier, uint64_t taskIdentifier, WebCore::ResourceError error)
 
     SetIsSuspended(bool suspended)
+    TearDownDrawingAreaForSuspend();
 
 #if HAVE(CFNETWORK_STORAGE_PARTITIONING)
     StorageAccessResponse(bool wasGranted, uint64_t contextId)

Modified: trunk/Source/WebKit/WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.h (236137 => 236138)


--- trunk/Source/WebKit/WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.h	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.h	2018-09-18 15:41:31 UTC (rev 236138)
@@ -103,7 +103,7 @@
     void addTransactionCallbackID(CallbackID) override;
     void setShouldScaleViewToFitDocument(bool) override;
 
-    void attachDrawingArea() override;
+    void attach() override;
 
     void adjustTransientZoom(double scale, WebCore::FloatPoint origin) override;
     void commitTransientZoom(double scale, WebCore::FloatPoint origin) override;

Modified: trunk/Source/WebKit/WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.mm (236137 => 236138)


--- trunk/Source/WebKit/WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.mm	2018-09-18 15:40:14 UTC (rev 236137)
+++ trunk/Source/WebKit/WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.mm	2018-09-18 15:41:31 UTC (rev 236138)
@@ -91,8 +91,6 @@
 
     updateLayerHostingContext();
     setColorSpace(parameters.colorSpace);
-
-    attachDrawingArea();
 }
 
 TiledCoreAnimationDrawingArea::~TiledCoreAnimationDrawingArea()
@@ -101,7 +99,7 @@
 }
 
 
-void TiledCoreAnimationDrawingArea::attachDrawingArea()
+void TiledCoreAnimationDrawingArea::attach()
 {
     LayerTreeContext layerTreeContext;
     layerTreeContext.contextID = m_layerHostingContext->contextID();
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