Enable more media unit tests on Android.

BUG=none
TEST=These tests work well on Nexus 10.

Review URL: https://codereview.chromium.org/25665009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226999 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226999