Added material design mouse hover feedback support.

ui/views/controls/button/custom_button.cc

 // 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.
 
 #include "ui/views/controls/button/custom_button.h"
 
 #include "ui/accessibility/ax_view_state.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/keycodes/keyboard_codes.h"
@@ skipping 294 matching lines @@
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // CustomButton, gfx::AnimationDelegate implementation:
 
 void CustomButton::AnimationProgressed(const gfx::Animation* animation) {
   SchedulePaint();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+// CustomButton, views::InkDropConsumer implementation:
+
+bool CustomButton::ShouldShowInkDropHover() {
+  return enabled() && IsMouseHovered();
+}
+
+////////////////////////////////////////////////////////////////////////////////
 // CustomButton, protected:
 
 CustomButton::CustomButton(ButtonListener* listener)
     : Button(listener),
       state_(STATE_NORMAL),
       animate_on_state_change_(true),
       is_throbbing_(false),
       triggerable_event_flags_(ui::EF_LEFT_MOUSE_BUTTON),
       request_focus_on_press_(true),
       notify_action_(NOTIFY_ON_RELEASE) {
@@ skipping 47 matching lines @@
   if (!details.is_add && state_ != STATE_DISABLED)
     SetState(STATE_NORMAL);
 }
 
 void CustomButton::OnBlur() {
   if (IsHotTracked())
     SetState(STATE_NORMAL);
 }
 
 }  // namespace views