Add ctrl+drag feature for allowing resizing window with exact positioning.

ash/wm/workspace/multi_window_resize_controller.h

Index: ash/wm/workspace/multi_window_resize_controller.h
diff --git a/ash/wm/workspace/multi_window_resize_controller.h b/ash/wm/workspace/multi_window_resize_controller.h
index 22bf7325056c6131e0ff5526292b60d31178fd76..8ef358f08c6c7c005425ac002bcf4f44e443c1c2 100644
--- a/ash/wm/workspace/multi_window_resize_controller.h
+++ b/ash/wm/workspace/multi_window_resize_controller.h
@@ -126,10 +126,10 @@ class ASH_EXPORT MultiWindowResizeController :
   void StartResize(const gfx::Point& screen_location);
 
   // Resizes to the new location.
-  void Resize(const gfx::Point& screen_location);
+  void Resize(const gfx::Point& screen_location, int event_flags);
 
   // Completes the resize.
-  void CompleteResize();
+  void CompleteResize(int event_flags);
 
   // Cancels the resize.
   void CancelResize();