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If the renderer can not run an image animation at the requested frame
rate, frames in the animation are skipped when trying to catch up to
the desired frame. Add an UMA to measure this to assess the smoothness
of these animations.

Bug: 735741
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I4d00dbeb6455f8e5badebbdec3403677ec2db462
Reviewed-on: https://chromium-review.googlesource.com/668016
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505898}