Add media perf benchamrk under network simulations.

The tests uses media served by cns.chrome:9000/ server under cable and wifi network conditions. 

BUG=311713
TEST=run_benchmark media.media_cns_cases
NOTRY=true

Review URL: https://codereview.chromium.org/91623004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238419 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238419
Blink roll 163007:163087

http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog_blink.html?url=/trunk&range=163008:163087&mode=html
TBR=
BUG=

Review URL: https://codereview.chromium.org/101963002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238420 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238421 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238421