Pass flag to chrome to use CRAS.
Pass flag to chrome to use CRAS.

Tell chrome to use the new ChromeOS Audio Server(CRAS).

BUG=25409
TEST=Build and run on lumpy, alex, listen to youtube/FLASH/HTML5.

Change-Id: Icd205dc61545355e0d075abdd73ea38e6ee0033c
Signed-off-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/19577

chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager