Use macros to define pepper interfaces

ppapi/thunk/enter.h

Index: ppapi/thunk/enter.h
diff --git a/ppapi/thunk/enter.h b/ppapi/thunk/enter.h
index e83a1a111ff121261b48a903d7f06fd8bc53bff4..ffa865d2d6962ba5f4ce9df19fc1b31bd5d1bb72 100644
--- a/ppapi/thunk/enter.h
+++ b/ppapi/thunk/enter.h
@@ -128,6 +128,24 @@ class EnterResourceNoLock : public EnterResource<ResourceT> {
   }
 };
 
+// Simpler wrapper to enter the resource creation API. This is used for every
+// class so we have this helper function to save template instantiations and
+// typing.
+class EnterResourceCreation : public EnterFunctionNoLock<ResourceCreationAPI> {
+ public:
+  EnterResourceCreation(PP_Instance instance);
+  ~EnterResourceCreation();
+};
+
+// Simpler wrapper to enter the instance API from proxy code. This is used for
+// many interfaces so we have this helper function to save template
+// instantiations and typing.
+class EnterInstance : public EnterFunctionNoLock<PPB_Instance_FunctionAPI> {
+ public:
+  EnterInstance(PP_Instance instance);
+  ~EnterInstance();
+};
+
 }  // namespace thunk
 }  // namespace ppapi