Add MD ink drop ripple to app list button

ash/shell.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 "ash/shell.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 
@@ skipping 321 matching lines @@
 void Shell::DismissAppList() {
   delegate_->GetAppListPresenter()->Dismiss();
 }
 
 void Shell::ToggleAppList(aura::Window* window) {
   // If the context window is not given, show it on the target root window.
   delegate_->GetAppListPresenter()->ToggleAppList(
       GetDisplayIdForWindow(window));
 }
 
+bool Shell::IsApplistVisible() const {
+  return delegate_->GetAppListPresenter()->IsVisible();
+}
+
 bool Shell::GetAppListTargetVisibility() const {
   return delegate_->GetAppListPresenter()->GetTargetVisibility();
 }
 
 bool Shell::IsSystemModalWindowOpen() const {
   if (simulate_modal_window_open_for_testing_)
     return true;
   const std::vector<aura::Window*> containers = GetContainersFromAllRootWindows(
       kShellWindowId_SystemModalContainer, nullptr);
   for (std::vector<aura::Window*>::const_iterator cit = containers.begin();
@@ skipping 891 matching lines @@
 
 void Shell::OnWindowActivated(
     aura::client::ActivationChangeObserver::ActivationReason reason,
     aura::Window* gained_active,
     aura::Window* lost_active) {
   if (gained_active)
     target_root_window_ = gained_active->GetRootWindow();
 }
 
 }  // namespace ash