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..738f14a8b04eb0d181d7f63f49b6adebdb991672 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,

[rjkroege, 2013/02/13 22:08:04]

nit: inverse ratios (i.e. multiplies are cheaper)

+                          wheel.deltaY / wheel.accelerationRatioY);
+      }
       break;
     }
     case WebKit::WebInputEvent::GestureScrollUpdate: {