Fix under-invalidation of media slider thumb when network state changes
When we invalidate a media control, we need to invalidate the whole
subtree because not only the top-level layout object but also the
descendants may paint differently.
BUG=
645225
TEST=paint/invalidation/video-play-no-source-under-invalidation.html
Committed:
https://crrev.com/b6f6dab6bacc9029e75e21df0b4be04783e675c6
Cr-Commit-Position: refs/heads/master@{#418750}