Refactor the way singleton-style resources are exposed via PPB_Instance

ppapi/shared_impl/resource.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_SHARED_IMPL_RESOURCE_H_
 #define PPAPI_SHARED_IMPL_RESOURCE_H_
 
 #include <stddef.h>  // For NULL.
 
 #include <string>
@@ skipping 22 matching lines @@
   F(PPB_FileIO_API) \
   F(PPB_FileRef_API) \
   F(PPB_FileSystem_API) \
   F(PPB_Find_API) \
   F(PPB_Flash_Clipboard_API) \
   F(PPB_Flash_DeviceID_API) \
   F(PPB_Flash_FontFile_API) \
   F(PPB_Flash_Functions_API) \
   F(PPB_Flash_Menu_API) \
   F(PPB_Flash_MessageLoop_API) \
+  F(PPB_Gamepad_API) \
   F(PPB_Graphics2D_API) \
   F(PPB_Graphics3D_API) \
   F(PPB_HostResolver_Private_API) \
   F(PPB_ImageData_API) \
   F(PPB_InputEvent_API) \
   F(PPB_LayerCompositor_API) \
   F(PPB_MessageLoop_API) \
   F(PPB_NetworkList_Private_API) \
   F(PPB_NetworkMonitor_Private_API) \
   F(PPB_PDFFont_API) \
@@ skipping 36 matching lines @@
 
 // Resources have slightly different registration behaviors when the're an
 // in-process ("impl") resource in the host (renderer) process, or when they're
 // a proxied resource in the plugin process. This enum differentiates those
 // cases.
 enum ResourceObjectType {
   OBJECT_IS_IMPL,
   OBJECT_IS_PROXY
 };
 
+// These IDs are used to access singleton resource objects using
+// PPB_Instance_API.GetSingletonResource.
+enum SingletonResourceID {
+  FLASH_SINGLETON_ID,
+  FLASH_CLIPBOARD_SINGLETON_ID,
+  GAMEPAD_SINGLETON_ID,
+};
+
 class PPAPI_SHARED_EXPORT Resource : public base::RefCounted<Resource> {
  public:
   // Constructor for impl and non-proxied, instance-only objects.
   //
   // For constructing "impl" (non-proxied) objects, this just takes the
   // associated instance, and generates a new resource ID. The host resource
   // will be the same as the newly-generated resource ID. For all objects in
   // the renderer (host) process, you'll use this constructor and call it with
   // OBJECT_IS_IMPL.
   //
@@ skipping 109 matching lines @@
 #define DEFINE_RESOURCE_CAST(RESOURCE) \
   template<> inline thunk::RESOURCE* Resource::GetAs() { \
     return As##RESOURCE(); \
   }
 FOR_ALL_PPAPI_RESOURCE_APIS(DEFINE_RESOURCE_CAST)
 #undef DEFINE_RESOURCE_CAST
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_RESOURCE_H_