Refactor the way singleton-style resources are exposed via PPB_Instance

webkit/plugins/ppapi/ppapi_plugin_instance.cc

Index: webkit/plugins/ppapi/ppapi_plugin_instance.cc
diff --git a/webkit/plugins/ppapi/ppapi_plugin_instance.cc b/webkit/plugins/ppapi/ppapi_plugin_instance.cc
index ea2bbfde091d3f76a09824438ac74ef2e157b804..b01b7e17c492fb348352ed6716d3d9a2b3238543 100644
--- a/webkit/plugins/ppapi/ppapi_plugin_instance.cc
+++ b/webkit/plugins/ppapi/ppapi_plugin_instance.cc
@@ -318,7 +318,13 @@ PluginInstance* PluginInstance::Create(PluginDelegate* delegate,
 }
 
 PluginInstance::GamepadImpl::GamepadImpl(PluginDelegate* delegate)
-    : delegate_(delegate) {
+    : ::ppapi::Resource(::ppapi::Resource::Untracked()),
+      delegate_(delegate) {
+}
+
+::ppapi::thunk::PPB_Gamepad_API*
+PluginInstance::GamepadImpl::AsPPB_Gamepad_API() {
+  return this;
 }
 
 void PluginInstance::GamepadImpl::Sample(PP_GamepadsSampleData* data) {
@@ -2113,23 +2119,25 @@ PP_Bool PluginInstance::GetScreenSize(PP_Instance instance, PP_Size* size) {
   return &flash_impl_;
 }
 
-::ppapi::thunk::PPB_Flash_Clipboard_API*
-PluginInstance::GetFlashClipboardAPI(PP_Instance /*instance*/) {
-  NOTIMPLEMENTED();
-  return NULL;
-}
+::ppapi::Resource* PluginInstance::GetSingletonResource(
+    PP_Instance instance,
+    ::ppapi::SingletonResourceID id) {
+  // Flash APIs aren't implemented in-process.
+  switch (id) {
+    case ::ppapi::FLASH_SINGLETON_ID:
+      NOTIMPLEMENTED();
+      return NULL;
+    case ::ppapi::FLASH_CLIPBOARD_SINGLETON_ID:
+      NOTIMPLEMENTED();
+      return NULL;
+    case ::ppapi::GAMEPAD_SINGLETON_ID:
+      return &gamepad_impl_;
+  }
 
-::ppapi::thunk::PPB_Flash_Functions_API*
-PluginInstance::GetFlashFunctionsAPI(PP_Instance /*instance*/) {
-  NOTIMPLEMENTED();
+  NOTREACHED();
   return NULL;
 }
 
-::ppapi::thunk::PPB_Gamepad_API* PluginInstance::GetGamepadAPI(
-    PP_Instance /* instance */) {
-  return &gamepad_impl_;
-}
-
 int32_t PluginInstance::RequestInputEvents(PP_Instance instance,
                                            uint32_t event_classes) {
   input_event_mask_ |= event_classes;