Add webm and mp4 480p/720p tests.

We wish to add more tests to cover all four combinations of mp4 and webm
across 480p and 720p definitions.

BUG=chromium:363815
TEST=Local tests on some devices.

Change-Id: I940bf497869dcd2fc14bf12bac68644f21c94102
Reviewed-on: https://chromium-review.googlesource.com/204898
Reviewed-by: Rohit Makasana <rohitbm@chromium.org>
Reviewed-by: Kris Rambish <krisr@chromium.org>
Commit-Queue: Mussa Kiroga <mussa@google.com>
Tested-by: Mussa Kiroga <mussa@google.com>
3 files changed