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

content/browser/renderer_host/web_input_event_aurax11.cc

Index: content/browser/renderer_host/web_input_event_aurax11.cc
diff --git a/content/browser/renderer_host/web_input_event_aurax11.cc b/content/browser/renderer_host/web_input_event_aurax11.cc
index 122c3457cb21598eb0c1d9492dff7987a500b064..a3ff99814e67d4673c1598efaed873870471bc39 100644
--- a/content/browser/renderer_host/web_input_event_aurax11.cc
+++ b/content/browser/renderer_host/web_input_event_aurax11.cc
@@ -145,9 +145,17 @@ WebKit::WebMouseWheelEvent MakeWebMouseWheelEventFromAuraEvent(
   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 =
+        webkit_event.deltaX / event->x_offset_ordinal();
+  }
   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 =
+        webkit_event.deltaY / event->y_offset_ordinal();
+  }
 
   return webkit_event;
 }