Chrome OS: Ash support for >=3 displays.

ash/wm/drag_window_resizer.h

Index: ash/wm/drag_window_resizer.h
diff --git a/ash/wm/drag_window_resizer.h b/ash/wm/drag_window_resizer.h
index 478016871c2e45d1c6a0e62281e3a3ee462f805d..3c6e1e2cc9b4ec41f3db0561bf2da0edb2ff7277 100644
--- a/ash/wm/drag_window_resizer.h
+++ b/ash/wm/drag_window_resizer.h
@@ -8,6 +8,7 @@
 #include "ash/wm/window_resizer.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
+#include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/gfx/point.h"
 
@@ -51,7 +52,7 @@ class ASH_EXPORT DragWindowResizer : public WindowResizer {
   scoped_ptr<WindowResizer> next_window_resizer_;
 
   // Shows a semi-transparent image of the window being dragged.
-  scoped_ptr<DragWindowController> drag_window_controller_;
+  ScopedVector<DragWindowController> drag_window_controllers_;
 
   gfx::Point last_mouse_location_;