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

chrome/browser/search/instant_service_unittest.cc

Index: chrome/browser/search/instant_service_unittest.cc
===================================================================
--- chrome/browser/search/instant_service_unittest.cc	(revision 270218)
+++ chrome/browser/search/instant_service_unittest.cc	(working copy)
@@ -106,9 +106,10 @@
   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());