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MediaPlayerRenderer does not report tracks or natural size in its
metadata. Due to the kMinimumVideoSize condition, MediaPlayerRenderer
WatchTime has not been reported starting in M69.

This CL reinitializes the WatchTimeReporter when MediaPlayerRenderer
emits its first natural size change event, and treats playback without
such an event as audio-only.

Bug: 959037
Change-Id: I4765e0a4d8044f084c313682092abedc205cc9cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1592617
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656472}