Add resource message call and reply infrastructure.

ppapi/proxy/resource_message_test_sink.h

Index: ppapi/proxy/resource_message_test_sink.h
diff --git a/ppapi/proxy/resource_message_test_sink.h b/ppapi/proxy/resource_message_test_sink.h
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+// 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_RESOURCE_MESSAGE_TEST_SINK_H_
+#define PPAPI_PROXY_RESOURCE_MESSAGE_TEST_SINK_H_
+
+#include "ipc/ipc_test_sink.h"
+
+namespace ppapi {
+namespace proxy {
+
+class ResourceMessageCallParams;
+class ResourceMessageReplyParams;
+
+// Extends IPC::TestSink to add extra capabilities for searching for and
+// decoding resource messages.
+class ResourceMessageTestSink : public IPC::TestSink {
+ public:
+  ResourceMessageTestSink();
+  virtual ~ResourceMessageTestSink();
+
+  // Searches the queue for the first resource call message with a nested
+  // message matching the given ID. On success, returns true and populates the
+  // givem params and nested message.
+  bool GetFirstResourceCallMatching(
+      uint32 id,
+      ResourceMessageCallParams* params,
+      IPC::Message* nested_msg) const;
+
+  // Like GetFirstResourceCallMatching except for replies.
+  bool GetFirstResourceReplyMatching(
+      uint32 id,
+      ResourceMessageReplyParams* params,
+      IPC::Message* nested_msg);
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_RESOURCE_MESSAGE_TEST_SINK_H_