components/exo: Extend pointer to use v5 protocol

components/exo/pointer_delegate.h

 // Copyright 2015 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 COMPONENTS_EXO_POINTER_DELEGATE_H_
 #define COMPONENTS_EXO_POINTER_DELEGATE_H_
 
 #include "base/time/time.h"
 #include "ui/events/event_constants.h"
 
 namespace gfx {
 class Point;
-class Vector2d;
+class Vector2dF;
 }
 
 namespace exo {
 class Pointer;
 class Surface;
 
 // Handles events on pointers in context-specific ways.
 class PointerDelegate {
  public:
   // Called at the top of the pointer's destructor, to give observers a
@@ skipping 18 matching lines @@
   virtual void OnPointerMotion(base::TimeDelta time_stamp,
                                const gfx::Point& location) = 0;
 
   // Called when pointer button state changed. |changed_button_flags| contains
   // all buttons that changed. |pressed| is true if buttons entered pressed
   // state.
   virtual void OnPointerButton(base::TimeDelta time_stamp,
                                int changed_button_flags,
                                bool pressed) = 0;
 
-  // Called when pointer wheel changed. |offset| contains the direction and
-  // distance of the change.
-  virtual void OnPointerWheel(base::TimeDelta time_stamp,
-                              const gfx::Vector2d& offset) = 0;
+  // Called when pointer is scrolling. |offset| contains the direction and
+  // distance of the change. |discrete| is true if the scrolling is caused
+  // by a discrete device such as a scroll wheel.
+  virtual void OnPointerScroll(base::TimeDelta time_stamp,
+                               const gfx::Vector2dF& offset,
+                               bool discrete) = 0;
+
+  // Called when pointer scroll has stopped and a fling is happening (e.g.
+  // lifting the fingers from the touchpad after scrolling quickly)
+  virtual void OnPointerScrollStop(base::TimeDelta time_stamp) = 0;
+
+  // Called after all pointer information of this frame has been set and the
+  // client should evaluate the updated state. No events are being sent before
+  // this method is called.
+  virtual void OnPointerFrame() = 0;
 
  protected:
   virtual ~PointerDelegate() {}
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_POINTER_DELEGATE_H_