Create ExtensionsRendererClient.

extensions/renderer/extensions_renderer_client.cc

Index: extensions/renderer/extensions_renderer_client.cc
diff --git a/extensions/renderer/extensions_renderer_client.cc b/extensions/renderer/extensions_renderer_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6fb5a96c2f93b3643af9e2ccf3e412524509aaef
--- /dev/null
+++ b/extensions/renderer/extensions_renderer_client.cc
@@ -0,0 +1,23 @@
+// Copyright 2014 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 "extensions/renderer/extensions_renderer_client.h"
+
+#include "base/basictypes.h"
+
+namespace extensions {
+
+namespace {
+
+ExtensionsRendererClient* g_client = NULL;
+
+}  // namespace
+
+ExtensionsRendererClient* ExtensionsRendererClient::Get() { return g_client; }
+
+void ExtensionsRendererClient::Set(ExtensionsRendererClient* client) {
+  g_client = client;
+}
+
+}  // namespace extensions