touch: Make sure the correct radius values are used for touch events.

ui/aura/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_AURA_EVENT_H_
 #define UI_AURA_EVENT_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 204 matching lines @@
   virtual int GetTouchId() const OVERRIDE;
   virtual int GetEventFlags() const OVERRIDE;
   virtual base::TimeDelta GetTimestamp() const OVERRIDE;
   virtual TouchEvent* Copy() const OVERRIDE;
 
  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. 1.0 if unknown.
+  // 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. 1.0 if unknown.
+  // 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_;
 
   // Force (pressure) of the touch. Normalized to be [0, 1]. Default to be 0.0.
   const float force_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchEvent);
 };
@@ skipping 148 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(GestureEvent);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_EVENT_H_