aura: Populate and use the newly added acceleration ratio fields in wheel-events.

content/browser/renderer_host/overscroll_controller.cc

Index: content/browser/renderer_host/overscroll_controller.cc
diff --git a/content/browser/renderer_host/overscroll_controller.cc b/content/browser/renderer_host/overscroll_controller.cc
index feb4247436317fd41b219209a1173f2c3544543b..dceefa4afe49c70fcf32780aa26621e0d68f0a69 100644
--- a/content/browser/renderer_host/overscroll_controller.cc
+++ b/content/browser/renderer_host/overscroll_controller.cc
@@ -171,8 +171,10 @@ void OverscrollController::ProcessEventForOverscroll(
     case WebKit::WebInputEvent::MouseWheel: {
       const WebKit::WebMouseWheelEvent& wheel =
           static_cast<const WebKit::WebMouseWheelEvent&>(event);
-      if (wheel.hasPreciseScrollingDeltas)
-        ProcessOverscroll(wheel.deltaX, wheel.deltaY);
+      if (wheel.hasPreciseScrollingDeltas) {
+        ProcessOverscroll(wheel.deltaX * wheel.accelerationRatioX,
+                          wheel.deltaY * wheel.accelerationRatioY);
+      }
       break;
     }
     case WebKit::WebInputEvent::GestureScrollUpdate: {