Re-implement overscan & Implement Display Rotation

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 cfe4e427183ed2a26185cdc3e31c31db2282057a..05378c89bbf56a8a449b8523aef4604417a52fca 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -24,6 +24,7 @@
 #include "ui/compositor/compositor.h"
 #include "ui/compositor/compositor_observer.h"
 #include "ui/compositor/layer_animation_observer.h"
+#include "ui/gfx/insets.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/point.h"
 
@@ -62,12 +63,14 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
                                public aura::RootWindowHostDelegate {
  public:
   struct AURA_EXPORT CreateParams {
-    // CreateParams with initial_bounds and default host.
+    // CreateParams with initial_bounds and default host in pixel.
     explicit CreateParams(const gfx::Rect& initial_bounds);
     ~CreateParams() {}
 
     gfx::Rect initial_bounds;
 
+    gfx::Insets initial_insets;
+
     // A host to use in place of the default one that RootWindow will create.
     // NULL by default.
     RootWindowHost* host;
@@ -98,12 +101,14 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
 
   RootWindowHostDelegate* AsRootWindowHostDelegate();
 
-  // Sets the size of the root window.
+  // Gets/sets the size of the host window.
   void SetHostSize(const gfx::Size& size_in_pixel);
   gfx::Size GetHostSize() const;
 
-  // Sets the bounds of the host window.
-  void SetHostBounds(const gfx::Rect& size_in_pixel);
+  // Sets the bounds and insets of the host window.
+  void SetHostBounds(const gfx::Rect& size_in_pizel);
+  void SetHostBoundsAndInsets(const gfx::Rect& bounds_in_pixel,
+                              const gfx::Insets& insets_in_pixel);
 
   // Returns where the RootWindow is on screen.
   gfx::Point GetHostOrigin() const;
@@ -316,6 +321,12 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   // |window| itself).
   void CleanupGestureRecognizerState(Window* window);
 
+  // Updates the root window's size using |host_size|, current
+  // transform and insets.
+  void UpdateWindowSize(const gfx::Size& host_size);
+
+  void SetTransformInternal(const gfx::Transform& transform);
+
   // Overridden from ui::EventDispatcherDelegate.
   virtual bool CanDispatchToTarget(EventTarget* target) OVERRIDE;