Aura: Throttle --ui-prioritize-in-gpu-process

Without this change, --ui-prioritize-in-gpu-process will preempt other clients
to service the browser UI whenever the browser UI wants to draw. This allows
the browser to starve other clients of the GPU process.

With this change, the browser has to wait 16 ms (a full frame) before
preempting other clients. This moderately affects interactivity (tested by
dragging a window on x86-alex while running
https://www.khronos.org/registry/webgl/sdk/demos/google/san-angeles/index.html)
but improves fairness and prevents starvation.

R=piman
BUG=171135,chrome-os-partner:14133,148382,chromium-os:37557


Review URL: https://chromiumcodereview.appspot.com/12040077

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@179016 0039d316-1c4b-4281-b951-d872f2087c98
9 files changed