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This CL adds a CSS rule to show a white pause icon on the non-overlay
play button when a video is playing.

Bug: 834396
Change-Id: I94694d2a3cecdb62d4f4a53b819e2f744ce61659
Reviewed-on: https://chromium-review.googlesource.com/1017345
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551834}