Add tabs.onReplaced event to notify listeners of tabs being swapped due to prerendering or instant.

chrome/browser/prerender/prerender_browsertest.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 <deque>
 
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
@@ skipping 2579 matching lines @@
 // Checks that the referrer policy is used when prerendering on HTTPS.
 IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, PrerenderSSLReferrerPolicy) {
   set_use_https_src(true);
   set_loader_path("files/prerender/prerender_loader_with_referrer_policy.html");
   PrerenderTestURL("files/prerender/prerender_referrer_policy.html",
                    FINAL_STATUS_USED,
                    1);
   NavigateToDestURL();
 }
 
-// Test interaction of the webNavigation API with prerender.
+// Test interaction of the webNavigation and tabs API with prerender.
 class PrerenderBrowserTestWithExtensions : public PrerenderBrowserTest,
                                            public ExtensionApiTest {
  public:
   PrerenderBrowserTestWithExtensions() {}
   virtual ~PrerenderBrowserTestWithExtensions() {}
 
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     PrerenderBrowserTest::SetUpCommandLine(command_line);
     ExtensionApiTest::SetUpCommandLine(command_line);
   }
@@ skipping 34 matching lines @@
   ChannelDestructionWatcher channel_close_watcher;
   channel_close_watcher.WatchChannel(
       chrome::GetActiveWebContents(browser())->GetRenderProcessHost());
   NavigateToDestURL();
   channel_close_watcher.WaitForChannelClose();
 
   ASSERT_TRUE(IsEmptyPrerenderLinkManager());
   ASSERT_TRUE(catcher.GetNextResult()) << catcher.message();
 }
 
+IN_PROC_BROWSER_TEST_F(PrerenderBrowserTestWithExtensions, TabsApi) {
+  // PrerenderBrowserTest automatically started a test server. Restart it, so
+  // ExtensionApiTest can register its test parameters.
+  test_server()->Stop();

[Matt Perry, 2013/01/04 00:21:07]

This is a little janky. Can you make it an option to auto-start the test server,
and turn it off for this test? Starting the test server is moderately expensive.

[justinlin, 2013/01/04 12:43:50]

Done.

+  ASSERT_TRUE(StartTestServer());
+  extensions::FrameNavigationState::set_allow_extension_scheme(true);
+
+  // Wait for the extension to set itself up and return control to us.
+  ASSERT_TRUE(RunExtensionSubtest("tabs/on_replaced", "on_replaced.html"))
+      << message_;
+
+  ResultCatcher catcher;
+
+  PrerenderTestURL("files/prerender/prerender_page.html", FINAL_STATUS_USED, 1);
+
+  ChannelDestructionWatcher channel_close_watcher;
+  channel_close_watcher.WatchChannel(
+      chrome::GetActiveWebContents(browser())->GetRenderProcessHost());
+  NavigateToDestURL();
+  channel_close_watcher.WaitForChannelClose();
+
+  ASSERT_TRUE(IsEmptyPrerenderLinkManager());
+  ASSERT_TRUE(catcher.GetNextResult()) << catcher.message();
+}
+
 }  // namespace prerender