mus: Change PointerWatcher to observe all pointer events, with moves optional.

ash/common/shelf/overflow_bubble.cc

Index: ash/common/shelf/overflow_bubble.cc
diff --git a/ash/common/shelf/overflow_bubble.cc b/ash/common/shelf/overflow_bubble.cc
index 0a5428ab3d96e75b88fbd295f1dc538efe66bdd2..401f299bbb3091309e058d08d5ee277df4530f2e 100644
--- a/ash/common/shelf/overflow_bubble.cc
+++ b/ash/common/shelf/overflow_bubble.cc
@@ -71,16 +71,11 @@ void OverflowBubble::ProcessPressedEvent(
   }
 }
 
-void OverflowBubble::OnMousePressed(const ui::MouseEvent& event,
-                                    const gfx::Point& location_in_screen,
-                                    views::Widget* target) {
-  ProcessPressedEvent(location_in_screen);
-}
-
-void OverflowBubble::OnTouchPressed(const ui::TouchEvent& event,
-                                    const gfx::Point& location_in_screen,
-                                    views::Widget* target) {
-  ProcessPressedEvent(location_in_screen);
+void OverflowBubble::OnPointerWatcherEvent(const ui::PointerEvent& event,
+                                           const gfx::Point& location_in_screen,
+                                           views::Widget* target) {
+  if (event.type() == ui::ET_POINTER_DOWN)
+    ProcessPressedEvent(location_in_screen);
 }
 
 void OverflowBubble::OnWidgetDestroying(views::Widget* widget) {