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

cc/input/input_handler.h

Index: cc/input/input_handler.h
diff --git a/cc/input/input_handler.h b/cc/input/input_handler.h
index e052a4980a4a2e41b0ff07cb5ec0a6e232275f70..fda17cdeee35f6fb8560104a42f2556a94b21b13 100644
--- a/cc/input/input_handler.h
+++ b/cc/input/input_handler.h
@@ -69,7 +69,7 @@ class CC_EXPORT InputHandler {
   // 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
@@ -84,12 +84,11 @@ class CC_EXPORT InputHandler {
   // 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.
@@ -97,7 +96,7 @@ class CC_EXPORT InputHandler {
 
   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.
@@ -114,7 +113,8 @@ class CC_EXPORT InputHandler {
   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,
@@ -125,7 +125,7 @@ class CC_EXPORT InputHandler {
   // 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