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If a CompositorFrame includes new updates from the main-thread, then
that frame should be treated as having complete update, rather than
partial update, even if the main-thread update is not for that
specific begin-frame.

BUG=1115376

Change-Id: I9987e77a3357c1c5eeb895514e584e780628fcc2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2381731Reviewed-by: Xida Chen <xidachen@chromium.org>
Reviewed-by: Behdad Bakhshinategh <behdadb@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803197}