Refactor PPB_Flash_Fullscreen to the new resource model.

ppapi/thunk/ppb_instance_api.h

Index: ppapi/thunk/ppb_instance_api.h
diff --git a/ppapi/thunk/ppb_instance_api.h b/ppapi/thunk/ppb_instance_api.h
index a89785c0a68c8aa9130f9c89d858c7664dba4795..cb524184eca320bd84810a97aad8076b54890fb0 100644
--- a/ppapi/thunk/ppb_instance_api.h
+++ b/ppapi/thunk/ppb_instance_api.h
@@ -49,8 +49,11 @@ class PPB_Instance_API {
   virtual PP_Bool BindGraphics(PP_Instance instance, PP_Resource device) = 0;
   virtual PP_Bool IsFullFrame(PP_Instance instance) = 0;
 
-  // Not an exposed PPAPI function, this returns the internal view data struct.
+  // Unexposed PPAPI functions for proxying.
+  // Returns the internal view data struct.
   virtual const ViewData* GetViewData(PP_Instance instance) = 0;
+  // Returns the flash fullscreen status.
+  virtual PP_Bool FlashIsFullscreen(PP_Instance instance) = 0;
 
   // InstancePrivate.
   virtual PP_Var GetWindowObject(PP_Instance instance) = 0;