Add ink drop ripple to overview mode button

ash/wm/maximize_mode/maximize_mode_controller_unittest.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/wm/maximize_mode/maximize_mode_controller.h"
 
 #include <math.h>
 #include <utility>
 #include <vector>
 
@@ skipping 459 matching lines @@
     return;
 
   UpdateDisplay("800x600,800x600");
   std::unique_ptr<aura::Window> w1(
       CreateTestWindowInShellWithBounds(gfx::Rect(0, 0, 100, 100)));
   std::unique_ptr<aura::Window> w2(
       CreateTestWindowInShellWithBounds(gfx::Rect(800, 0, 100, 100)));
   ASSERT_NE(w1->GetRootWindow(), w2->GetRootWindow());
 
   maximize_mode_controller()->EnableMaximizeModeWindowManager(true);
-  WmShell::Get()->window_selector_controller()->ToggleOverview();
+  EXPECT_TRUE(WmShell::Get()->window_selector_controller()->ToggleOverview());
 
   UpdateDisplay("800x600");
   EXPECT_FALSE(WmShell::Get()->window_selector_controller()->IsSelecting());
   EXPECT_EQ(w1->GetRootWindow(), w2->GetRootWindow());
 }
 
 // Test that the disabling of the internal display exits maximize mode, and that
 // while disabled we do not re-enter maximize mode.
 TEST_F(MaximizeModeControllerTest, NoMaximizeModeWithDisabledInternalDisplay) {
   UpdateDisplay("200x200, 200x200");
@@ skipping 69 matching lines @@
 // accelerometer updates which would normally cause it to exit do not.
 TEST_F(MaximizeModeControllerSwitchesTest, IgnoreHingeAngles) {
   maximize_mode_controller()->EnableMaximizeModeWindowManager(true);
 
   // Would normally trigger an exit from maximize mode.
   OpenLidToAngle(90.0f);
   EXPECT_TRUE(IsMaximizeModeStarted());
 }
 
 }  // namespace ash