Aura/ash split: Don't use X11 window borders.

ui/aura/root_window.h

Index: ui/aura/root_window.h
diff --git a/ui/aura/root_window.h b/ui/aura/root_window.h
index 708fa6cefbfee9b5889dec3e30397806b0f97e5f..411be8ea92868b5ab6ebe52858f6efa97c205eac 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -136,6 +136,9 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   // Draw the whole screen.
   void ScheduleFullDraw();
 
+  // Used to enable or disable the native window borders on a window.
+  void SetUseHostWindowBorders(bool use_os_borders);
+
   // Handles a mouse event. Returns true if handled.
   bool DispatchMouseEvent(MouseEvent* event);
 
@@ -153,6 +156,10 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   // events are dispatched from GestureRecognizer instead of RootWindowHost.
   bool DispatchGestureEvent(GestureEvent* event);
 
+  // Handles when we're told that the operating system should move the
+  // window. Returns true if handled.
+  bool DispatchHostWindowDragMovement(int hittest, MouseEvent* event);
+
   // Called when the host changes size.
   void OnHostResized(const gfx::Size& size_in_pixel);