Pass --ui-prioritize-in-gpu-process into chrome.
Pass --ui-prioritize-in-gpu-process into chrome.

BUG=None
TEST=smoothly drag a window of https://cvs.khronos.org/svn/repos/registry/trunk/public/webgl/sdk/demos/google/san-angeles/index.html on alex

Change-Id: I1bc578fab6c33e40660accc62e22bb274acc8183
Reviewed-on: https://gerrit.chromium.org/gerrit/24723
Commit-Ready: Jonathan Backer <05936ba925afb7ed97277e08b6ed6d37010004cd@chromium.org>
Reviewed-by: Jonathan Backer <05936ba925afb7ed97277e08b6ed6d37010004cd@chromium.org>
Tested-by: Jonathan Backer <05936ba925afb7ed97277e08b6ed6d37010004cd@chromium.org>

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