Protoype Mac input event filter

content/browser/renderer_host/render_widget_host_view_mac.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_MAC_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 #include <IOSurface/IOSurfaceAPI.h>
 #include <list>
@@ skipping 17 matching lines @@
 #import "content/public/browser/render_widget_host_view_mac_base.h"
 #include "ipc/ipc_sender.h"
 #include "third_party/WebKit/public/web/WebCompositionUnderline.h"
 #include "ui/accelerated_widget_mac/accelerated_widget_mac.h"
 #include "ui/accelerated_widget_mac/io_surface_layer.h"
 #include "ui/base/cocoa/base_view.h"
 #include "ui/base/cocoa/remote_layer_api.h"
 #include "ui/gfx/display_observer.h"
 
 namespace content {
+class RenderWidgetHostImpl;
 class RenderWidgetHostViewMac;
 class RenderWidgetHostViewMacEditCommandHelper;
 class WebContents;
+class WheelEventRailFilterMac;
 }
 
 namespace ui {
 class Compositor;
 class Layer;
 }
 
 @class FullscreenWindowManager;
 @protocol RenderWidgetHostViewMacDelegate;
 @class ToolTip;
@@ skipping 141 matching lines @@
 - (void)pluginFocusChanged:(BOOL)focused forPlugin:(int)pluginId;
 // Evaluates the event in the context of plugin IME, if plugin IME is enabled.
 // Returns YES if the event was handled.
 - (BOOL)postProcessEventForPluginIme:(NSEvent*)event;
 - (void)updateCursor:(NSCursor*)cursor;
 - (NSRect)firstViewRectForCharacterRange:(NSRange)theRange
                              actualRange:(NSRangePointer)actualRange;
 @end
 
 namespace content {
-class RenderWidgetHostImpl;
 
 ///////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewMac
 //
 //  An object representing the "View" of a rendered web page. This object is
 //  responsible for displaying the content of the web page, and integrating with
 //  the Cocoa view system. It is the implementation of the RenderWidgetHostView
 //  that the cross-platform RenderWidgetHost object uses
 //  to display the data.
 //
@@ skipping 17 matching lines @@
   //
   // When |is_guest_view_hack| is true, this view isn't really the view for
   // the |widget|, a RenderWidgetHostViewGuest is.
   // TODO(lazyboy): Remove |is_guest_view_hack| once BrowserPlugin has migrated
   // to use RWHVChildFrame (http://crbug.com/330264).
   RenderWidgetHostViewMac(RenderWidgetHost* widget, bool is_guest_view_hack);
   ~RenderWidgetHostViewMac() override;
 
   RenderWidgetHostViewCocoa* cocoa_view() const { return cocoa_view_; }
 
+  scoped_ptr<WheelEventRailFilterMac> wheel_event_rail_filter_;
+
   // |delegate| is used to separate out the logic from the NSResponder delegate.
   // |delegate| is retained by this class.
   // |delegate| should be set at most once.
   CONTENT_EXPORT void SetDelegate(
     NSObject<RenderWidgetHostViewMacDelegate>* delegate);
   void SetAllowPauseForResizeOrRepaint(bool allow);
 
   // RenderWidgetHostView implementation.
   bool OnMessageReceived(const IPC::Message& msg) override;
   void InitAsChild(gfx::NativeView parent_view) override;
@@ skipping 324 matching lines @@
 
   // Factory used to safely scope delayed calls to ShutdownHost().
   base::WeakPtrFactory<RenderWidgetHostViewMac> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewMac);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_