Implement aura::Window::CreateCompositorFrameSink()

ui/aura/window_port.h

Index: ui/aura/window_port.h
diff --git a/ui/aura/window_port.h b/ui/aura/window_port.h
index df3da59658480ccb6e46a05c7d63acf8168b41d2..f0ea5bef9785c3341a7840d972834b39853275e3 100644
--- a/ui/aura/window_port.h
+++ b/ui/aura/window_port.h
@@ -10,11 +10,17 @@
 #include <memory>
 #include <string>
 
+#include "base/callback.h"
 #include "base/observer_list.h"
 #include "base/strings/string16.h"
+#include "cc/surfaces/surface_id.h"
 #include "ui/aura/aura_export.h"
 #include "ui/base/class_property.h"
 
+namespace cc {
+class CompositorFrameSink;
+}
+
 namespace gfx {
 class Rect;
 }
@@ -70,6 +76,16 @@ class AURA_EXPORT WindowPort {
                                  int64_t old_value,
                                  std::unique_ptr<ui::PropertyData> data) = 0;
 
+  // Called for creating a cc::CompositorFrameSink for the window.
+  virtual std::unique_ptr<cc::CompositorFrameSink>
+  CreateCompositorFrameSink() = 0;
+
+  // Get the current cc::SurfaceId.
+  virtual cc::SurfaceId GetSurfaceId() const = 0;
+
+  virtual void OnWindowAddedToRootWindow() = 0;
+  virtual void OnWindowRemovingFromRootWindow() = 0;
+
  protected:
   // Returns the WindowPort associated with a Window.
   static WindowPort* Get(Window* window);