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

content/browser/renderer_host/web_input_event_aurax11.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Portions based heavily on:
 // third_party/WebKit/Source/WebKit/chromium/public/gtk/WebInputEventFactory.cpp
 //
 /*
  * Copyright (C) 2006-2011 Google Inc. All rights reserved.
  *
@@ skipping 127 matching lines @@
 WebKit::WebMouseWheelEvent MakeWebMouseWheelEventFromAuraEvent(
     ui::ScrollEvent* event) {
   WebKit::WebMouseWheelEvent webkit_event;
 
   webkit_event.type = WebKit::WebInputEvent::MouseWheel;
   webkit_event.button = WebKit::WebMouseEvent::ButtonNone;
   webkit_event.modifiers = EventFlagsToWebEventModifiers(event->flags());
   webkit_event.timeStampSeconds = event->time_stamp().InSecondsF();
   webkit_event.hasPreciseScrollingDeltas = true;
   webkit_event.deltaX = event->x_offset();
+  if (event->x_offset_ordinal() != 0.f && event->x_offset() != 0.f) {
+    webkit_event.accelerationRatioX =
+        event->x_offset_ordinal() / event->x_offset();
+  }
   webkit_event.wheelTicksX = webkit_event.deltaX / kPixelsPerTick;
   webkit_event.deltaY = event->y_offset();
   webkit_event.wheelTicksY = webkit_event.deltaY / kPixelsPerTick;
+  if (event->y_offset_ordinal() != 0.f && event->y_offset() != 0.f) {
+    webkit_event.accelerationRatioY =
+        event->y_offset_ordinal() / event->y_offset();
+  }
 
   return webkit_event;
 }
 
 // NOTE: ui::ScrollEvent instances come from the touchpad.
 WebKit::WebGestureEvent MakeWebGestureEventFromAuraEvent(
     ui::ScrollEvent* event) {
   WebKit::WebGestureEvent webkit_event;
 
   switch (event->type()) {
@@ skipping 61 matching lines @@
   }
 
   webkit_event.setKeyIdentifierFromWindowsKeyCode();
 
   // TODO: IsAutoRepeat/IsKeyPad?
 
   return webkit_event;
 }
 
 }  // namespace content