mac: History swiping doesn't work right with iframes.

content/browser/renderer_host/render_widget_host_view_base.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_BASE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_BASE_H_
 
 #if defined(OS_MACOSX)
 #include <OpenGL/OpenGL.h>
 #endif
@@ skipping 62 matching lines @@
   virtual bool IsMouseLocked() OVERRIDE;
   virtual gfx::Size GetVisibleViewportSize() const OVERRIDE;
   virtual void SetInsets(const gfx::Insets& insets) OVERRIDE;
   virtual void BeginFrameSubscription(
       scoped_ptr<RenderWidgetHostViewFrameSubscriber> subscriber) OVERRIDE;
   virtual void EndFrameSubscription() OVERRIDE;
 
   // IPC::Listener implementation:
   virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
 
-  // Called when a mousewheel event was not processed by the renderer.
+  // Called after the renderer has ACKed a mousewheel event. |consumed|
+  // reflects whether the event was consumed by the renderer or the render
+  // widget host's delegate.
   // virtual for testing.
-  virtual void UnhandledWheelEvent(const blink::WebMouseWheelEvent& event);
+  virtual void ProcessedWheelEvent(const blink::WebMouseWheelEvent& event,
+                                   bool consumed);
 
   // Called by the host when the input flush has completed.
   void OnDidFlushInput();
 
   void SetPopupType(blink::WebPopupType popup_type);
 
   blink::WebPopupType GetPopupType();
 
   // Get the BrowserAccessibilityManager if it exists, may return NULL.
   BrowserAccessibilityManager* GetBrowserAccessibilityManager() const;
@@ skipping 333 matching lines @@
   uint32 renderer_frame_number_;
 
   base::OneShotTimer<RenderWidgetHostViewBase> flush_input_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewBase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_BASE_H_