Wires up drags to pointer watcher adapter.

ash/common/wm_shell.h

Index: ash/common/wm_shell.h
diff --git a/ash/common/wm_shell.h b/ash/common/wm_shell.h
index 3db0a06101b8f4178ba92b0bbf246f701d6bb07e..ffbb9d1fa1838bcaaa82c36665065464dc3a6b6b 100644
--- a/ash/common/wm_shell.h
+++ b/ash/common/wm_shell.h
@@ -29,6 +29,7 @@ class Point;
 
 namespace views {
 class PointerWatcher;
+enum class PointerWatcherEventTypes;
 }
 
 namespace ash {
@@ -324,11 +325,14 @@ class ASH_EXPORT WmShell {
   void AddShellObserver(ShellObserver* observer);
   void RemoveShellObserver(ShellObserver* observer);
 
-  // If |wants_moves| is true PointerWatcher::OnPointerEventObserved() is
-  // called for pointer move events. Enabling pointer moves may incur a
-  // performance hit and should be avoided if possible.
+  // If |events| is PointerWatcherEventTypes::MOVES,
+  // PointerWatcher::OnPointerEventObserved() is called for pointer move events.
+  // If |events| is PointerWatcherEventTypes::DRAGS,
+  // PointerWatcher::OnPointerEventObserved() is called for pointer drag events.
+  // Requesting pointer moves or drags may incur a performance hit and should be
+  // avoided if possible.
   virtual void AddPointerWatcher(views::PointerWatcher* watcher,
-                                 bool wants_moves) = 0;
+                                 views::PointerWatcherEventTypes events) = 0;
   virtual void RemovePointerWatcher(views::PointerWatcher* watcher) = 0;
 
   // TODO: Move these back to LockStateController when that has been moved.