GitLab

Let the VideoFileHandler detect a low disk space condition,
and notify the CaptureModeController with this. We then end
the video recording and tell the user about the reason why
recording ended.

BUG=1142994
TEST=Manually, Added a unittest.

Change-Id: I5e007693c90424491f8300d61fb3d424658c2b35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2551938Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829814}