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 74e59be6ac0d1fe1fa814928409f39319be004b1..aaf84caf96fce6a975986e1579f8599953c39b77 100644
--- a/ash/common/shelf/overflow_bubble.cc
+++ b/ash/common/shelf/overflow_bubble.cc
@@ -71,16 +71,12 @@ 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::OnPointerEventObserved(
+    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) {