Add ZoomLevelChanged and DidChangeScrollOffset to RenderViewObserver

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 4aa576c64a7beebb7f5983d19afecf1481600738..c7876748c06bbda21d3bb5d2dae6d56b21c73759 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -55,6 +55,7 @@ using WebKit::WebCompositionUnderline;
 using WebKit::WebCursorInfo;
 using WebKit::WebInputEvent;
 using WebKit::WebMouseEvent;
+using WebKit::WebMouseWheelEvent;
 using WebKit::WebNavigationPolicy;
 using WebKit::WebPagePopup;
 using WebKit::WebPoint;
@@ -588,6 +589,9 @@ void RenderWidget::OnHandleInputEvent(const IPC::Message& message) {
       DidHandleMouseEvent(*(static_cast<const WebMouseEvent*>(input_event)));
     if (WebInputEvent::isTouchEventType(input_event->type))
       DidHandleTouchEvent(*(static_cast<const WebTouchEvent*>(input_event)));
+    if (input_event->type == WebInputEvent::MouseWheel)
+      DidHandleWheelEvent(
+          *(static_cast<const WebMouseWheelEvent*>(input_event)));
   }
 }