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In webview, frames with no damage sometimes call AbortDraw to prevent
draws. These aborts should not set did_draw_in_last_frame_ or the
scheduler will request new BeginFrames when it doesn't need to.

This CL stops setting did_draw_in_last_frame_ in AbortDraw while still
setting it in WillDraw.

Bug: 687695
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I84c39a5e06d578ea92558d81ce2fad5dc423cf75
Reviewed-on: https://chromium-review.googlesource.com/933292
Commit-Queue: James Wallace-Lee <jamwalla@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542229}