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If a frame is not produced, and the reason is anything other than
'no damage', (e.g. if draw is aborted because of checkerboarding
etc.), then mark that frame as a 'dropped frame'.

BUG=790761

Change-Id: I9783563fe2d8e87fa0fabad91895fc238b8050b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2147694
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Behdad Bakhshinategh <behdadb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759917}