Add resource message call and reply infrastructure.

ppapi/proxy/resource_message_test_sink.cc

Index: ppapi/proxy/resource_message_test_sink.cc
diff --git a/ppapi/proxy/resource_message_test_sink.cc b/ppapi/proxy/resource_message_test_sink.cc
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+++ b/ppapi/proxy/resource_message_test_sink.cc
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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.
+
+#include "ppapi/proxy/resource_message_test_sink.h"
+
+#include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/proxy/resource_message_params.h"
+
+namespace ppapi {
+namespace proxy {
+
+namespace {
+
+// Backend for GetFirstResource[Call|Reply]Matching.
+template<class WrapperMessage, class Params>
+bool GetFirstResourceMessageMatching(const ResourceMessageTestSink& sink,
+                                     uint32 id,
+                                     Params* params,
+                                     IPC::Message* nested_msg) {
+  for (size_t i = 0; i < sink.message_count(); i++) {
+    const IPC::Message* msg = sink.GetMessageAt(i);
+    if (msg->type() == WrapperMessage::ID) {
+      Params cur_params;
+      IPC::Message cur_msg;
+      WrapperMessage::Read(msg, &cur_params, &cur_msg);
+      if (cur_msg.type() == id) {
+        *params = cur_params;
+        *nested_msg = cur_msg;
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+}  // namespace
+
+ResourceMessageTestSink::ResourceMessageTestSink() {
+}
+
+ResourceMessageTestSink::~ResourceMessageTestSink() {
+}
+
+bool ResourceMessageTestSink::GetFirstResourceCallMatching(
+    uint32 id,
+    ResourceMessageCallParams* params,
+    IPC::Message* nested_msg) const {
+  return GetFirstResourceMessageMatching<PpapiHostMsg_ResourceCall,
+                                         ResourceMessageCallParams>(
+      *this, id, params, nested_msg);
+}
+
+bool ResourceMessageTestSink::GetFirstResourceReplyMatching(
+    uint32 id,
+    ResourceMessageReplyParams* params,
+    IPC::Message* nested_msg) {
+  return GetFirstResourceMessageMatching<PpapiPluginMsg_ResourceReply,
+                                         ResourceMessageReplyParams>(
+      *this, id, params, nested_msg);
+}
+
+}  // namespace proxy
+}  // namespace ppapi