Add MD ink drop ripple to app list button

ui/views/animation/ink_drop_host_view.cc

 // Copyright 2016 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/animation/ink_drop_host_view.h"
 
 #include "ui/events/event.h"
 #include "ui/events/scoped_target_handler.h"
 #include "ui/gfx/color_palette.h"
 #include "ui/gfx/geometry/size_conversions.h"
@@ skipping 203 matching lines @@
 SkColor InkDropHostView::GetInkDropBaseColor() const {
   NOTREACHED();
   return gfx::kPlaceholderColor;
 }
 
 bool InkDropHostView::ShouldShowInkDropForFocus() const {
   return false;
 }
 
 void InkDropHostView::SetHasInkDrop(bool has_an_ink_drop) {
+  bool handles_gesture_event = has_an_ink_drop;
+  SetHasInkDrop(has_an_ink_drop, handles_gesture_event);
+}
+
+void InkDropHostView::SetHasInkDrop(bool has_an_ink_drop,
+                                    bool handles_gesture_event) {
   if (has_an_ink_drop) {
     ink_drop_.reset(new InkDropImpl(this));
-    gesture_handler_.reset(new InkDropGestureHandler(this, ink_drop_.get()));
+    if (handles_gesture_event)
+      gesture_handler_.reset(new InkDropGestureHandler(this, ink_drop_.get()));
+    else
+      gesture_handler_.reset();
   } else {
+    DCHECK(!handles_gesture_event);
     gesture_handler_.reset();
     ink_drop_.reset(new InkDropStub());
   }
 }
 
 }  // namespace views