Add latency info to input events sent to RenderWidget.

This keeps track of the latency info for input events, and sends that down into the RenderWidget and into the compositor. It also collects the latency info when swap happens with gtk and returns it the the RenderWidgetHostImpl.

BUG=155367

Review URL: https://chromiumcodereview.appspot.com/13931009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@199340 0039d316-1c4b-4281-b951-d872f2087c98
25 files changed