Wires up drags to pointer watcher adapter.

ui/views/pointer_watcher.h

Index: ui/views/pointer_watcher.h
diff --git a/ui/views/pointer_watcher.h b/ui/views/pointer_watcher.h
index 715ec130193bc51707283caa7f7247ab90549e6e..7a68216db7d3b030452edf0dab44aa271efd8d66 100644
--- a/ui/views/pointer_watcher.h
+++ b/ui/views/pointer_watcher.h
@@ -19,6 +19,20 @@ class PointerEvent;
 namespace views {
 class Widget;
 
+// When a PointerWatcher is added the types of events desired is specified by
+// way of PointerWatcherEventTypes.
+enum class PointerWatcherEventTypes {
+  // The PointerWatcher is interested in press, release, capture and mouse
+  // wheel.
+  BASIC,
+  // The PointerWatcher is interested in BASIC events, as well as move
+  // events.
+  MOVES,
+  // The PointerWatcher is interested in MOVE events, as well as drag
+  // events.
+  DRAGS
+};
+
 // An interface for read-only observation of pointer events (in particular, the
 // events cannot be marked as handled). Only certain event types are supported.
 // The |target| is the top-level widget that will receive the event, if any.