First pass at implementing the MessageLoop interface. This includes a simple

ppapi/proxy/ppb_message_loop_proxy.h

Index: ppapi/proxy/ppb_message_loop_proxy.h
diff --git a/ppapi/proxy/ppb_message_loop_proxy.h b/ppapi/proxy/ppb_message_loop_proxy.h
new file mode 100644
index 0000000000000000000000000000000000000000..aaf120a9be1071e63afa4186b76d65ec6e4991ea
--- /dev/null
+++ b/ppapi/proxy/ppb_message_loop_proxy.h
@@ -0,0 +1,30 @@
+// 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_PROXY_PPB_MESSAGE_LOOP_PROXY_H_
+#define PPAPI_PROXY_PPB_MESSAGE_LOOP_PROXY_H_
+
+#include "base/basictypes.h"
+#include "ppapi/proxy/interface_proxy.h"
+
+struct PPB_MessageLoop_Dev_0_1;
+
+namespace ppapi {
+namespace proxy {
+
+class PPB_MessageLoop_Proxy : public InterfaceProxy {
+ public:
+  PPB_MessageLoop_Proxy(Dispatcher* dispatcher);
+  virtual ~PPB_MessageLoop_Proxy();
+
+  static const PPB_MessageLoop_Dev_0_1* GetInterface();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PPB_MessageLoop_Proxy);
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_PPB_MESSAGE_LOOP_PROXY_H_