gestures: Cleanup touch-event handling code in Windows.

ui/base/event.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 UI_BASE_EVENT_H_
 #define UI_BASE_EVENT_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/event_types.h"
@@ skipping 224 matching lines @@
   virtual EventType GetEventType() const OVERRIDE;
   virtual gfx::Point GetLocation() const OVERRIDE;
   virtual int GetTouchId() const OVERRIDE;
   virtual int GetEventFlags() const OVERRIDE;
   virtual base::TimeDelta GetTimestamp() const OVERRIDE;
   virtual float RadiusX() const OVERRIDE;
   virtual float RadiusY() const OVERRIDE;
   virtual float RotationAngle() const OVERRIDE;
   virtual float Force() const OVERRIDE;
 
+ protected:
+  void set_radius(float radius_x, float radius_y) {
+    radius_x_ = radius_x;
+    radius_y_ = radius_y;
+  }
+
+  void set_rotation_angle(float rotation_angle) {
+    rotation_angle_ = rotation_angle;
+  }
+
+  void set_force(float force) { force_ = force; }
+
  private:
   // The identity (typically finger) of the touch starting at 0 and incrementing
   // for each separable additional touch that the hardware can detect.
   const int touch_id_;
 
   // Radius of the X (major) axis of the touch ellipse. 0.0 if unknown.
   float radius_x_;
 
   // Radius of the Y (minor) axis of the touch ellipse. 0.0 if unknown.
   float radius_y_;
 
   // Angle of the major axis away from the X axis. Default 0.0.
-  const float rotation_angle_;
+  float rotation_angle_;
 
   // Force (pressure) of the touch. Normalized to be [0, 1]. Default to be 0.0.
-  const float force_;
+  float force_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchEventImpl);
 };
 
 class UI_EXPORT KeyEvent : public Event {
  public:
   KeyEvent(const base::NativeEvent& native_event, bool is_char);
 
   // Used for synthetic events in testing.
   KeyEvent(EventType type, KeyboardCode key_code, int flags);
@@ skipping 141 matching lines @@
   // This value is stored as a bitfield because the number of touch ids varies,
   // but we currently don't need more than 32 touches at a time.
   const unsigned int touch_ids_bitfield_;
 
   DISALLOW_COPY_AND_ASSIGN(GestureEventImpl);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_EVENT_H_