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While a window is being recorded, the user may drag it to
a different display.
  - This event must be propagated to the recording service, so that
    the video capturer can change its target frame sink to that of the
    root window of the display the window was moved to.
The new display may have different bounds than that of the old display.
  - The recording service must also handle this case by reconfiguring
    the VPX video encoder as it will be getting video frames that match
    the new display size.

This CL also fixes a bug where the recorded window shows up as squished
in the output video. This was because we used to initialize the video
encoder with the current window's bounds rather than the root's bounds.

Demo is on the first bug.

BUG=1165702, 1165708
TEST=Manually, added new tests in ash_unittests and browser_tests.

Change-Id: I53b8e34d1752925d2ee356b98b21c8360e863ee3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2623712
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843773}