Add a new resizer corner overlay.

chrome/common/slide_animation.h

 // Copyright (c) 2006-2008 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 CHROME_COMMON_SLIDE_ANIMATION_H_
 #define CHROME_COMMON_SLIDE_ANIMATION_H_
 
 #include "chrome/common/animation.h"
 
 // Slide Animation
@@ skipping 55 matching lines @@
   virtual void Hide();
 
   // Sets the time a slide will take. Note that this isn't actually
   // the amount of time an animation will take as the current value of
   // the slide is considered.
   virtual void SetSlideDuration(int duration) { slide_duration_ = duration; }
   int GetSlideDuration() const { return slide_duration_; }
   void SetTweenType(TweenType tween_type) { tween_type_ = tween_type; }
 
   double GetCurrentValue() const { return value_current_; }
-  bool IsShowing() { return showing_; }
+  bool IsShowing() const { return showing_; }
 
  private:
   // Overridden from Animation.
   void AnimateToState(double state);
 
   AnimationDelegate* target_;
 
   TweenType tween_type_;
 
   // Used to determine which way the animation is going.
   bool showing_;
 
   // Animation values. These are a layer on top of Animation::state_ to
   // provide the reversability.
   double value_start_;
   double value_end_;
   double value_current_;
 
   // How long a hover in/out animation will last for. This defaults to
   // kHoverFadeDurationMS, but can be overridden with SetDuration.
   int slide_duration_;
 };
 
 #endif  // CHROME_COMMON_SLIDE_ANIMATION_H_