Implement Wheel Gesture Scrolling on OSX.

content/renderer/input/input_handler_manager.h

 // Copyright 2013 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_RENDERER_INPUT_INPUT_HANDLER_MANAGER_H_
 #define CONTENT_RENDERER_INPUT_INPUT_HANDLER_MANAGER_H_
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 43 matching lines @@
                        const base::WeakPtr<cc::InputHandler>& input_handler,
                        const base::WeakPtr<RenderViewImpl>& render_view_impl,
                        bool enable_smooth_scrolling,
                        bool enable_wheel_gestures);
 
   void ObserveWheelEventAndResultOnMainThread(
       int routing_id,
       const blink::WebMouseWheelEvent& wheel_event,
       const cc::InputHandlerScrollResult& scroll_result);
 
+  void ObserveGestureEventAndResultOnMainThread(
+      int routing_id,
+      const blink::WebGestureEvent& gesture_event,
+      const cc::InputHandlerScrollResult& scroll_result);
+
   void NonBlockingInputEventHandledOnMainThread(int routing_id,
                                                 blink::WebInputEvent::Type);
 
   // Callback only from the compositor's thread.
   void RemoveInputHandler(int routing_id);
 
   // Called from the compositor's thread.
   InputEventAckState HandleInputEvent(int routing_id,
                                       const blink::WebInputEvent* input_event,
                                       ui::LatencyInfo* latency_info);
@@ skipping 15 matching lines @@
       const base::WeakPtr<cc::InputHandler>& input_handler,
       const base::WeakPtr<RenderViewImpl>& render_view_impl,
       bool enable_smooth_scrolling,
       bool enable_wheel_gestures);
 
   void ObserveWheelEventAndResultOnCompositorThread(
       int routing_id,
       const blink::WebMouseWheelEvent& wheel_event,
       const cc::InputHandlerScrollResult& scroll_result);
 
+  void ObserveGestureEventAndResultOnCompositorThread(
+      int routing_id,
+      const blink::WebGestureEvent& gesture_event,
+      const cc::InputHandlerScrollResult& scroll_result);
+
   void NonBlockingInputEventHandledOnCompositorThread(
       int routing_id,
       blink::WebInputEvent::Type);
 
   typedef base::ScopedPtrHashMap<int,  // routing_id
                                  scoped_ptr<InputHandlerWrapper>>
       InputHandlerMap;
   InputHandlerMap input_handlers_;
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   InputHandlerManagerClient* client_;
   scheduler::RendererScheduler* renderer_scheduler_;  // Not owned.
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_INPUT_INPUT_HANDLER_MANAGER_H_