Disable crowd* tests on ChromeOS because they are causing timeouts on daisy.
Create new benchmark for media perf-tests on ChromeOS.

BUG=330059

Review URL: https://codereview.chromium.org/113903007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243275 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243275