Added material design mouse hover feedback support.

ui/views/controls/button/custom_button.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_VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/events/event_constants.h"
@@ skipping 88 matching lines @@
   void GetAccessibleState(ui::AXViewState* state) override;
   void VisibilityChanged(View* starting_from, bool is_visible) override;
 
   // Overridden from gfx::AnimationDelegate:
   void AnimationProgressed(const gfx::Animation* animation) override;
 
   // Overridden from views::InkDropHost:
   void AddInkDropLayer(ui::Layer* ink_drop_layer) override;
   void RemoveInkDropLayer(ui::Layer* ink_drop_layer) override;
   gfx::Point CalculateInkDropCenter() const override;
+  bool ShouldShowInkDropHover() const override;
 
  protected:
   // Construct the Button with a Listener. See comment for Button's ctor.
   explicit CustomButton(ButtonListener* listener);
 
   // Invoked from SetState() when SetState() is passed a value that differs from
   // the current state. CustomButton's implementation of StateChanged() does
   // nothing; this method is provided for subclasses that wish to do something
   // on state changes.
   virtual void StateChanged();
@@ skipping 10 matching lines @@
   void set_has_ink_drop_action_on_click(bool has_ink_drop_action_on_click) {
     has_ink_drop_action_on_click_ = has_ink_drop_action_on_click;
   }
 
   // Returns true if the button should enter hovered state; that is, if the
   // mouse is over the button, and no other window has capture (which would
   // prevent the button from receiving MouseExited events and updating its
   // state). This does not take into account enabled state.
   bool ShouldEnterHoveredState();
 
+  // Updates the |ink_drop_delegate_|'s hover state.
+  void UpdateInkDropHoverState();
+
   InkDropDelegate* ink_drop_delegate() const { return ink_drop_delegate_; }
   void set_ink_drop_delegate(InkDropDelegate* ink_drop_delegate) {
     ink_drop_delegate_ = ink_drop_delegate;
   }
 
   // Overridden from View:
   void OnBoundsChanged(const gfx::Rect& previous_bounds) override;
   void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) override;
   void OnBlur() override;
@@ skipping 44 matching lines @@
   // The animation action to trigger on the |ink_drop_delegate_| when the button
   // is clicked.
   InkDropState ink_drop_action_on_click_;
 
   DISALLOW_COPY_AND_ASSIGN(CustomButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_