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 e6b1e424155d41e75056cdf1744fc2e7e2684fcc..2014f19560ae4bbf5d9429dc17e60675906d5009 100644
--- a/ui/views/animation/ink_drop_host_view.cc
+++ b/ui/views/animation/ink_drop_host_view.cc
@@ -221,10 +221,20 @@ 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());
   }