Comment #3 on issue 28958 by [email protected]: There should be only one  
PluginMsg_UpdateGeometry in flight at a time
http://code.google.com/p/chromium/issues/detail?id=28958

This adds a bit of complexity, and again, I still don't see the problem  
that it
solves.

Say you hold off sending the UpdateGeometry message until you receive an  
ack for the
previous one.  The ack will presumbly be another async message.  So now if  
the
renderer is not running a nested message loop (say because there's a sync  
Send()
lower down the callstack), the ack won't be dispatched and hence the  
UpdateGeometry
won't be sent until the callstack unwinds.  Will the WebPluginDelegateProxy  
keep
different sizes, for what it sent, and what it will send next?  Which sizes  
will it
use when it needs a size?

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