Added `test.screenshot` system property to the `ScreenCaptureTestWatcher` to control writing of the screenshot data url to stderr.
Added corresponding gradle option `TEST_SCREENSHOT`. The function is disabled by default for privacy reasons. ------------- Commit messages: - test.screenshot system property Changes: https://git.openjdk.org/jfx/pull/1910/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1910&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8367915 Stats: 18 lines in 2 files changed: 15 ins; 0 del; 3 mod Patch: https://git.openjdk.org/jfx/pull/1910.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1910/head:pull/1910 PR: https://git.openjdk.org/jfx/pull/1910
