Merge to M39: MSE: Relax H.264 Baseline mimetype profile recognition

Merge to M39: MSE: Relax H.264 Baseline mimetype profile recognition

This change lets "avc[13].42y0xx", where y >= 0x8 and xx is a valid
level, be an unambiguously matched H.264 Baseline profile. This relaxes
the previous requirement of a constrained baseline where y had to be
0xE.

CodecParameter | Before                            | Now
----------------------------------------------------------------------------------------------------
avc[13].42y0xx | probably if y==E, maybe otherwise | probably if y is in [89ABCDEF], maybe otherwise

BUG=408552
TBR=mmenke@chromium.org,qinmin@chromium.org,dalecurtis@chromium.org,xhwang@chromium.org
TEST=Updated MediaCanPlayTypeTest.CodecSupportTest_*

Review URL: https://codereview.chromium.org/626163002

Cr-Commit-Position: refs/heads/master@{#298163}
(cherry picked from commit 0a0cad0dfcd0c8ea77352fb23bd2e955744355d5)

Committed: https://chromium.googlesource.com/chromium/src/+/2f8d073aeab9292dbe43dfd03c6d75fc9f2e053e

[wolenetz, 2014-10-06 23:23:13]

wolenetz@chromium.org changed reviewers:
+ mmenke@chromium.org
- rsleevi@chromium.org

[wolenetz, 2014-10-06 23:26:38]

I will land this once tree is open.
Updated TBR to reflect the actual net/ reviewer of this (mmenke@) when it was
landed on ToT.

[wolenetz, 2014-10-07 02:33:06]

Committed patchset #1 (id:1) manually as
2f8d073aeab9292dbe43dfd03c6d75fc9f2e053e (presubmit successful).