ash: Improved window maximize/restore animations

ui/aura/window.h

Index: ui/aura/window.h
diff --git a/ui/aura/window.h b/ui/aura/window.h
index 6eeed931d07a629b691ebb4c036d2cdeeb146d10..06f8812f93ed6212bafa7f45834dbb703c91602c 100644
--- a/ui/aura/window.h
+++ b/ui/aura/window.h
@@ -11,6 +11,7 @@
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "base/string16.h"
@@ -76,6 +77,12 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
   // Initializes the window. This creates the window's layer.
   void Init(ui::LayerType layer_type);
 
+  // Creates a new layer for the window. Erases the layer-owned bounds, so the
+  // caller may wish to set new bounds and other state on the window/layer.
+  // Returns the old layer, which can be used for animations. Caller owns the
+  // memory for the returned layer and must delete it when animation completes.
+  ui::Layer* RecreateLayer() WARN_UNUSED_RESULT;
+
   void set_owned_by_parent(bool owned_by_parent) {
     owned_by_parent_ = owned_by_parent;
   }