Add ink drop ripple to overview mode button

ash/wm/maximize_mode/maximize_mode_window_manager_unittest.cc

Index: ash/wm/maximize_mode/maximize_mode_window_manager_unittest.cc
diff --git a/ash/wm/maximize_mode/maximize_mode_window_manager_unittest.cc b/ash/wm/maximize_mode/maximize_mode_window_manager_unittest.cc
index 3923e50d98ce24da23bf3d0b23fac12906943618..5e483a17f2001e5b820ba256d2ff3c08305612e9 100644
--- a/ash/wm/maximize_mode/maximize_mode_window_manager_unittest.cc
+++ b/ash/wm/maximize_mode/maximize_mode_window_manager_unittest.cc
@@ -1272,13 +1272,13 @@ TEST_F(MaximizeModeWindowManagerTest, ExitsOverview) {
 
   WindowSelectorController* window_selector_controller =
       WmShell::Get()->window_selector_controller();
-  window_selector_controller->ToggleOverview();
+  ASSERT_TRUE(window_selector_controller->ToggleOverview());
   ASSERT_TRUE(window_selector_controller->IsSelecting());
   MaximizeModeWindowManager* manager = CreateMaximizeModeWindowManager();
   ASSERT_TRUE(manager);
   EXPECT_FALSE(window_selector_controller->IsSelecting());
 
-  window_selector_controller->ToggleOverview();
+  ASSERT_TRUE(window_selector_controller->ToggleOverview());
   ASSERT_TRUE(window_selector_controller->IsSelecting());
   // Destroy the manager again and check that the windows return to their
   // previous state.