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The dropped-frame counter needs to be reset after navigation to avoid
showing (or reporting) dropped-frame count from the previous page.

BUG=1115376

Change-Id: Id9fd54df5fcaf31b6d69e7e7d1190ac29581b6df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366613
Auto-Submit: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800284}