Expand the Material Design hover as it fades out when a ripple is triggered.

ui/views/animation/ink_drop_animation_controller_impl.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 UI_VIEWS_ANIMATION_INK_DROP_ANIMATION_CONTROLLER_IMPL_H_
 #define UI_VIEWS_ANIMATION_INK_DROP_ANIMATION_CONTROLLER_IMPL_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/geometry/rect.h"
@@ skipping 55 matching lines @@
   // is visible.
   bool IsHoverFadingInOrVisible() const;
 
   // views::InkDropAnimationObserver:
   void InkDropAnimationStarted(InkDropState ink_drop_state) override;
   void InkDropAnimationEnded(InkDropState ink_drop_state,
                              InkDropAnimationEndedReason reason) override;
 
   // Enables or disables the hover state based on |is_hovered| and if an
   // animation is triggered it will be scheduled to have the given
-  // |animation_duration|.
-  void SetHoveredInternal(bool is_hovered, base::TimeDelta animation_duration);
+  // |animation_duration|. If |explode| is true the hover will expand as it
+  // fades out. |explode| is ignored when |is_hovered| is true.
+  void SetHoveredInternal(bool is_hovered,
+                          base::TimeDelta animation_duration,
+                          bool explode);
 
   // Starts the |hover_after_animation_timer_| timer. This will stop the current
   // |hover_after_animation_timer_| instance if it exists.
   void StartHoverAfterAnimationTimer();
 
   // Stops and destroys the current |hover_after_animation_timer_| instance.
   void StopHoverAfterAnimationTimer();
 
   // Callback for when the |hover_after_animation_timer_| fires.
   void HoverAfterAnimationTimerFired();
@@ skipping 20 matching lines @@
 
   // The timer used to delay the hover fade in after an ink drop animation.
   scoped_ptr<base::Timer> hover_after_animation_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(InkDropAnimationControllerImpl);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_ANIMATION_INK_DROP_ANIMATION_CONTROLLER_IMPL_H_