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For a touchpad based gesture event, we want to know whether the source
wheel event was handled blocking or non-blocking, and we can flush the
vsync queue immediately if it was blocking.

Bug: 526463
Test: InputHandlerProxyEventQueueTest.TouchpadGestureScrollEndFlushQueue
Change-Id: I051f042dc7da6f901d135a5f7785a97d25581d8e
Reviewed-on: https://chromium-review.googlesource.com/849313Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Sahel Sharifymoghaddam <sahel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526847}