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

chrome/browser/search/instant_service_unittest.cc

 // Copyright 2013 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/metrics/field_trial.h"
 #include "base/strings/string_util.h"
@@ skipping 88 matching lines @@
   scoped_ptr<content::MockRenderProcessHost> rph(
       new content::MockRenderProcessHost(profile()));
   rph->sink().ClearMessages();
   instant_service_->Observe(
       content::NOTIFICATION_RENDERER_PROCESS_CREATED,
       content::Source<content::MockRenderProcessHost>(rph.get()),
       content::NotificationService::NoDetails());
   EXPECT_EQ(1U, rph->sink().message_count());
   const IPC::Message* msg = rph->sink().GetMessageAt(0);
   ASSERT_TRUE(msg);
-  std::vector<GURL> search_urls;
-  GURL new_tab_page_url;
-  ChromeViewMsg_SetSearchURLs::Read(msg, &search_urls, &new_tab_page_url);
+  ChromeViewMsg_SetSearchURLs::Param params;
+  ChromeViewMsg_SetSearchURLs::Read(msg, &params);
+  std::vector<GURL> search_urls = params.a;
+  GURL new_tab_page_url = params.b;
   EXPECT_EQ(2U, search_urls.size());
   EXPECT_EQ("https://www.google.com/alt#quux=", search_urls[0].spec());
   EXPECT_EQ("https://www.google.com/url?bar=", search_urls[1].spec());
   EXPECT_EQ("https://www.google.com/newtab", new_tab_page_url.spec());
 }
 
 TEST_F(InstantServiceTest, InstantSearchDisabled) {
   // 'prefetch_results' flag is not enabled in field trials. Make sure
   // InstantSearchPrerenderer is not initialized.
   EXPECT_EQ(static_cast<InstantSearchPrerenderer*>(NULL),
@@ skipping 35 matching lines @@
   NotifyGoogleBaseURLUpdate(new_base_url);
   EXPECT_NE(old_prerenderer, GetInstantSearchPrerenderer());
 }
 
 TEST_F(InstantServiceTest, OmniboxStartMarginChanged) {
   int new_start_margin = 92;
   EXPECT_CALL(*instant_service_observer_.get(),
               OmniboxStartMarginChanged(new_start_margin)).Times(1);
   UpdateOmniboxStartMargin(new_start_margin);
 }