[#8] Pass gfx::Point by const ref.

cc/input/input_handler.h

 // Copyright 2011 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 CC_INPUT_INPUT_HANDLER_H_
 #define CC_INPUT_INPUT_HANDLER_H_
 
 #include "base/basictypes.h"
 #include "base/time/time.h"
 #include "cc/base/cc_export.h"
@@ skipping 51 matching lines @@
   // Binds a client to this handler to receive notifications. Only one client
   // can be bound to an InputHandler. The client must live at least until the
   // handler calls WillShutdown() on the client.
   virtual void BindToClient(InputHandlerClient* client) = 0;
 
   // Selects a layer to be scrolled at a given point in viewport (logical
   // pixel) coordinates. Returns ScrollStarted if the layer at the coordinates
   // can be scrolled, ScrollOnMainThread if the scroll event should instead be
   // delegated to the main thread, or ScrollIgnored if there is nothing to be
   // scrolled at the given coordinates.
-  virtual ScrollStatus ScrollBegin(gfx::Point viewport_point,
+  virtual ScrollStatus ScrollBegin(const gfx::Point& viewport_point,
                                    ScrollInputType type) = 0;
 
   // Scroll the selected layer starting at the given position. If the scroll
   // type given to ScrollBegin was a gesture, then the scroll point and delta
   // should be in viewport (logical pixel) coordinates. Otherwise they are in
   // scrolling layer's (logical pixel) space. If there is no room to move the
   // layer in the requested direction, its first ancestor layer that can be
   // scrolled will be moved instead. If no layer can be moved in the requested
   // direction at all, then false is returned. If any layer is moved, then
   // true is returned.
   // If the scroll delta hits the root layer, and the layer can no longer move,
   // the root overscroll accumulated within this ScrollBegin() scope is reported
   // to the client.
   // Should only be called if ScrollBegin() returned ScrollStarted.
-  virtual bool ScrollBy(gfx::Point viewport_point,
+  virtual bool ScrollBy(const gfx::Point& viewport_point,
                         const gfx::Vector2dF& scroll_delta) = 0;
 
-  virtual bool ScrollVerticallyByPage(
-      gfx::Point viewport_point,
-      ScrollDirection direction) = 0;
+  virtual bool ScrollVerticallyByPage(const gfx::Point& viewport_point,
+                                      ScrollDirection direction) = 0;
 
   // Returns ScrollStarted if a layer was being actively being scrolled,
   // ScrollIgnored if not.
   virtual ScrollStatus FlingScrollBegin() = 0;
 
   virtual void NotifyCurrentFlingVelocity(const gfx::Vector2dF& velocity) = 0;
 
-  virtual void MouseMoveAt(gfx::Point mouse_position) = 0;
+  virtual void MouseMoveAt(const gfx::Point& mouse_position) = 0;
 
   // Stop scrolling the selected layer. Should only be called if ScrollBegin()
   // returned ScrollStarted.
   virtual void ScrollEnd() = 0;
 
   virtual void SetRootLayerScrollOffsetDelegate(
       LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate) = 0;
 
   // Called when the value returned by
   // LayerScrollOffsetDelegate.GetTotalScrollOffset has changed for reasons
   // other than a SetTotalScrollOffset call.
   // NOTE: This should only called after a valid delegate was set via a call to
   // SetRootLayerScrollOffsetDelegate.
   virtual void OnRootLayerDelegatedScrollOffsetChanged() = 0;
 
   virtual void PinchGestureBegin() = 0;
-  virtual void PinchGestureUpdate(float magnify_delta, gfx::Point anchor) = 0;
+  virtual void PinchGestureUpdate(float magnify_delta,
+                                  const gfx::Point& anchor) = 0;
   virtual void PinchGestureEnd() = 0;
 
   virtual void StartPageScaleAnimation(const gfx::Vector2d& target_offset,
                                        bool anchor_point,
                                        float page_scale,
                                        base::TimeDelta duration) = 0;
 
   // Request another callback to InputHandlerClient::Animate().
   virtual void ScheduleAnimation() = 0;
 
-  virtual bool HaveTouchEventHandlersAt(gfx::Point viewport_point) = 0;
+  virtual bool HaveTouchEventHandlersAt(const gfx::Point& viewport_point) = 0;
 
   // Calling CreateLatencyInfoSwapPromiseMonitor() to get a scoped
   // LatencyInfoSwapPromiseMonitor. During the life time of the
   // LatencyInfoSwapPromiseMonitor, if SetNeedsRedraw() or SetNeedsRedrawRect()
   // is called on LayerTreeHostImpl, the original latency info will be turned
   // into a LatencyInfoSwapPromise.
   virtual scoped_ptr<SwapPromiseMonitor> CreateLatencyInfoSwapPromiseMonitor(
       ui::LatencyInfo* latency) = 0;
 
  protected:
   InputHandler() {}
   virtual ~InputHandler() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InputHandler);
 };
 
 }  // namespace cc
 
 #endif  // CC_INPUT_INPUT_HANDLER_H_