Added material design mouse hover feedback support.

ui/views/controls/button/custom_button_unittest.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 "base/macros.h"
 #include "build/build_config.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/layout.h"
@@ skipping 105 matching lines @@
       case InkDropState::HIDDEN:
         *ink_hidden_ = true;
         break;
       case InkDropState::QUICK_ACTION:
       case InkDropState::SLOW_ACTION:
       case InkDropState::DEACTIVATED:
         break;
     }
   }
 
+  void SetHovered(bool is_hovered) override {}
+
  private:
   InkDropHost* ink_drop_host_;
   bool* ink_shown_;
   bool* ink_hidden_;
 
   DISALLOW_COPY_AND_ASSIGN(TestInkDropDelegate);
 };
 
 // A test Button class that owns a TestInkDropDelegate.
 class TestButtonWithInkDrop : public TestCustomButton {
@@ skipping 330 matching lines @@
   generator.PressLeftButton();
   EXPECT_TRUE(ink_shown());
   EXPECT_FALSE(ink_hidden());
 
   widget()->SetCapture(button());
   widget()->ReleaseCapture();
   EXPECT_TRUE(ink_hidden());
 }
 
 }  // namespace views