Enable unified GR by default in Aura.

content/public/test/browser_test_utils.cc

Index: content/public/test/browser_test_utils.cc
diff --git a/content/public/test/browser_test_utils.cc b/content/public/test/browser_test_utils.cc
index fa2c79996dbd61094cd2eb298758820931e46628..a98db4355171349b1b88eb8d8ea9f522ecf37cf2 100644
--- a/content/public/test/browser_test_utils.cc
+++ b/content/public/test/browser_test_utils.cc
@@ -266,12 +266,12 @@ void SimulateTapAt(WebContents* web_contents, const gfx::Point& point) {
              ui::GestureConfiguration::
                  max_touch_down_duration_in_seconds_for_click());
   SyntheticWebTouchEvent touch;
-  touch.timeStampSeconds = 0;
+  touch.SetTimestamp(base::TimeTicks::Now() - base::TimeTicks());

[Paweł Hajdan Jr., 2014/06/05 10:17:53]

nit: Could you add a comment why we do this weird TimeTicks - TimeTicks dance?

[tdresser, 2014/06/05 12:05:08]

Done.

   touch.PressPoint(point.x(), point.y());
   RenderWidgetHostImpl* widget_host =
       RenderWidgetHostImpl::From(web_contents->GetRenderViewHost());
   widget_host->ForwardTouchEvent(touch);
-  touch.timeStampSeconds = kTapDurationSeconds;
+  touch.timeStampSeconds += kTapDurationSeconds;
   touch.ReleasePoint(0);
   widget_host->ForwardTouchEvent(touch);
 }