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

ash/wm/default_window_resizer.h

Index: ash/wm/default_window_resizer.h
diff --git a/ash/wm/default_window_resizer.h b/ash/wm/default_window_resizer.h
index ea7d114e338a41a43e900a2799df0f787b6956e2..7ce1f1f63173eae34b31feb8eb99237572b9313f 100644
--- a/ash/wm/default_window_resizer.h
+++ b/ash/wm/default_window_resizer.h
@@ -26,8 +26,7 @@ class ASH_EXPORT DefaultWindowResizer : public WindowResizer {
   // returned object. Returns NULL if not resizable.
   static DefaultWindowResizer* Create(aura::Window* window,
                                       const gfx::Point& location,
-                                      int window_component,
-                                      int grid_size);
+                                      int window_component);
 
   // Returns true if the drag will result in changing the window in anyway.
   bool is_resizable() const { return details_.is_resizable; }
@@ -38,8 +37,8 @@ class ASH_EXPORT DefaultWindowResizer : public WindowResizer {
   aura::Window* target_window() const { return details_.window; }
 
   // WindowResizer overides:
-  virtual void Drag(const gfx::Point& location) OVERRIDE;
-  virtual void CompleteDrag() OVERRIDE;
+  virtual void Drag(const gfx::Point& location, int event_flags) OVERRIDE;
+  virtual void CompleteDrag(int event_flags) OVERRIDE;
   virtual void RevertDrag() OVERRIDE;
 
  private: