Add ink drop ripple to overview mode button

ash/common/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc

 // Copyright 2014 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 "ash/common/system/chromeos/virtual_keyboard/virtual_keyboard_tray.h"
 
 #include <algorithm>
 
 #include "ash/common/keyboard/keyboard_ui.h"
 #include "ash/common/material_design/material_design_controller.h"
@@ skipping 23 matching lines @@
     icon_->SetImage(image_md);
   } else {
     gfx::ImageSkia* image_non_md =
         ui::ResourceBundle::GetSharedInstance().GetImageSkiaNamed(
             IDR_AURA_UBER_TRAY_VIRTUAL_KEYBOARD);
     icon_->SetImage(image_non_md);
   }
 
   SetIconBorderForShelfAlignment();
   tray_container()->AddChildView(icon_);
-  SetContentsBackground();
+  SetContentsBackground(true);
   // The Shell may not exist in some unit tests.
   if (WmShell::HasInstance())
     WmShell::Get()->keyboard_ui()->AddObserver(this);
   // Try observing keyboard controller, in case it is already constructed.
   ObserveKeyboardController();
 }
 
 VirtualKeyboardTray::~VirtualKeyboardTray() {
   // Try unobserving keyboard controller, in case it still exists.
   UnobserveKeyboardController();
@@ skipping 32 matching lines @@
     // shown/hidden.
     ObserveKeyboardController();
   } else {
     // Try unobserving keyboard controller, in case it is not yet destroyed.
     UnobserveKeyboardController();
   }
 }
 
 void VirtualKeyboardTray::OnKeyboardBoundsChanging(
     const gfx::Rect& new_bounds) {
-  SetDrawBackgroundAsActive(!new_bounds.IsEmpty());
+  SetIsActive(!new_bounds.IsEmpty());
 }
 
 void VirtualKeyboardTray::OnKeyboardClosed() {}
 
 void VirtualKeyboardTray::SetIconBorderForShelfAlignment() {
   // Every time shelf alignment is updated, StatusAreaWidgetDelegate resets the
   // border to a non-null border. So, we need to remove it.
   if (!ash::MaterialDesignController::IsShelfMaterial())
     tray_container()->SetBorder(views::NullBorder());
   const gfx::ImageSkia& image = icon_->GetImage();
@@ skipping 19 matching lines @@
 }
 
 void VirtualKeyboardTray::UnobserveKeyboardController() {
   keyboard::KeyboardController* keyboard_controller =
       keyboard::KeyboardController::GetInstance();
   if (keyboard_controller)
     keyboard_controller->RemoveObserver(this);
 }
 
 }  // namespace ash