Add MD ink drop ripple to app list button

ui/views/animation/ink_drop_host_view.cc

Index: ui/views/animation/ink_drop_host_view.cc
diff --git a/ui/views/animation/ink_drop_host_view.cc b/ui/views/animation/ink_drop_host_view.cc
index 924770abf7b36e0c3785a9cfc55258a6638a9337..01de362ffd03e575e62e5d340cb4883d562bbf9b 100644
--- a/ui/views/animation/ink_drop_host_view.cc
+++ b/ui/views/animation/ink_drop_host_view.cc
@@ -193,10 +193,20 @@ bool InkDropHostView::ShouldShowInkDropForFocus() const {
 }
 
 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());
   }