Set scale/orientation property to aura root window

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 fe41b7eebf147ec2aca333391ec206735dd8c976..491f6b3d50829db74b4854eb682e34bfa1f52517 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -105,6 +105,9 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   // Sets the bounds of the host window.
   void SetHostBounds(const gfx::Rect& size_in_pixel);
 
+  // Sets an integer property on the host window using platform-specific means.
+  void SetHostWindowIntProperty(const std::string& name, int value);
+
   // Returns where the RootWindow is on screen.
   gfx::Point GetHostOrigin() const;