Start separating the text track container from the media controls

Having the text track container as a part of the media controls makes it
harder to show and hide the controls as a group, which would be useful.

This CL prepares for this by moving and renaming code, with no observable
difference. However, some small drive-by fixes are included:

TextTrackContainer::m_videoDisplaySize is made into an IntSize, since
the position part is never used. It's also renamed to just m_videoSize.

(Based on https://codereview.chromium.org/949203002/)

BUG=448795

Review URL: https://codereview.chromium.org/988763002

git-svn-id: svn://svn.chromium.org/blink/trunk@191538 bbb929c8-8fbe-4397-9dbb-9b2b20218538
14 files changed
tree: bdb83e92e984b1129ba372aff7ff5edbc7b03c87
  1. third_party/