Use macros to define pepper interfaces

ppapi/thunk/enter.cc

Index: ppapi/thunk/enter.cc
diff --git a/ppapi/thunk/enter.cc b/ppapi/thunk/enter.cc
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+++ b/ppapi/thunk/enter.cc
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+// Copyright (c) 2011 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.
+
+#include "ppapi/thunk/enter.h"
+
+#include "ppapi/thunk/ppb_instance_api.h"
+#include "ppapi/thunk/resource_creation_api.h"
+
+namespace ppapi {
+namespace thunk {
+
+EnterResourceCreation::EnterResourceCreation(PP_Instance instance)
+    : EnterFunctionNoLock<ResourceCreationAPI>(instance, true) {
+}
+
+EnterResourceCreation::~EnterResourceCreation() {
+}
+
+EnterInstance::EnterInstance(PP_Instance instance)
+    : EnterFunctionNoLock<PPB_Instance_FunctionAPI>(instance, true) {
+}
+
+EnterInstance::~EnterInstance() {
+}
+
+}  // namespace thunk
+}  // namespace ppapi