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Two changes to PipelineReporter traces:
 . Set |state| correctly for partial updates.
 . For dropped (or partially dropped) frames, report whether
   the frame affects smoothness or not.

BUG=1125152

Change-Id: If282c20bc19931b14b3f71c589e9fa78e25e4710
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410618
Commit-Queue: Xida Chen <xidachen@chromium.org>
Auto-Submit: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806757}