Add support for passing an arbitrary parameter to an IPC message handler. The motivation is for Web…

content/child/resource_dispatcher_unittest.cc

 // 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 <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/process/process.h"
@@ skipping 94 matching lines @@
   virtual bool Send(IPC::Message* msg) OVERRIDE {
     message_queue_.push_back(IPC::Message(*msg));
     delete msg;
     return true;
   }
 
   // Emulates the browser process and processes the pending IPC messages,
   // returning the hardcoded file contents.
   void ProcessMessages() {
     while (!message_queue_.empty()) {
-      int request_id;
-      ResourceHostMsg_Request request;
+      ResourceHostMsg_RequestResource::Param params;
       ASSERT_TRUE(ResourceHostMsg_RequestResource::Read(
-          &message_queue_[0], &request_id, &request));
+          &message_queue_[0], &params));
+      int request_id = params.b;
+      ResourceHostMsg_Request request = params.c;
 
       // check values
       EXPECT_EQ(test_page_url, request.url.spec());
 
       // received response message
       ResourceResponseHead response;
       std::string raw_headers(test_page_headers);
       std::replace(raw_headers.begin(), raw_headers.end(), '\n', '\0');
       response.headers = new net::HttpResponseHeaders(raw_headers);
       response.mime_type = test_page_mime_type;
@@ skipping 304 matching lines @@
   response_head.error_code = net::OK;
 
   PerformTest(response_head);
 
   EXPECT_EQ(base::TimeTicks(), response_info().load_timing.request_start);
   EXPECT_EQ(base::TimeTicks(),
             response_info().load_timing.connect_timing.dns_start);
 }
 
 }  // namespace content