Move DIP translation from ui/aura to ui/compositor

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 94ec02f6c46fc6375f52e8770ba2f998f5194646..e4fdc1c0f305f7e5265187b3a0fc5da0e97d82fb 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -12,7 +12,6 @@
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
 #include "ui/aura/aura_export.h"
-#include "ui/aura/dip_util.h"
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/window.h"
 #include "ui/base/cursor/cursor.h"
@@ -105,11 +104,11 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   void ShowRootWindow();
 
   // Sets the size of the root window.
-  void SetHostSize(const gfx::Size& size);
+  void SetHostSize(const gfx::Size& size_in_pixel);

[Daniel Erat, 2012/05/07 19:44:05]

i think i might've heard/seen someone mention this already, but "in_pixels" is a
bit better than "in_pixel"

[oshima, 2012/05/08 00:17:24]

I used pixel to refer to Pixel Coordinates, but not pixel units, 
and sky was ok with it (we use dip for DIP not dips for example).
That's bing said, I'm no expert on choosing English term, and
I can change if you and sky still think pixels is better. Let me know.

   gfx::Size GetHostSize() const;
 
   // Sets the bounds of the host window.
-  void SetHostBounds(const gfx::Rect& size);
+  void SetHostBounds(const gfx::Rect& size_in_pixel);
 
   // Returns where the RootWindow is on screen.
   gfx::Point GetHostOrigin() const;
@@ -155,7 +154,7 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   bool DispatchGestureEvent(GestureEvent* event);
 
   // Called when the host changes size.
-  void OnHostResized(const gfx::Size& size);
+  void OnHostResized(const gfx::Size& size_in_pixel);
 
   // Invoked when |window| is being destroyed.
   void OnWindowDestroying(Window* window);