[DevTools] Ensure that tab agent hosts get "page" type

chrome/browser/devtools/devtools_sanity_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 <stddef.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 1825 matching lines @@
   DispatchOnTestSuite(window_, "enableAutoAttachToCreatedPages");
   DevToolsWindowCreationObserver observer;
   ASSERT_TRUE(content::ExecuteScript(
       GetInspectedTab(), "window.open('window_open.html', '_blank');"));
   observer.WaitForLoad();
   DispatchOnTestSuite(observer.devtools_window(), "waitForDebuggerPaused");
   DevToolsWindowTesting::CloseDevToolsWindowSync(observer.devtools_window());
   CloseDevToolsWindow();
 }
 
+IN_PROC_BROWSER_TEST_F(DevToolsSanityTest, SecondTabAfterDevTools) {
+  OpenDevToolsWindow(kDebuggerTestPage, true);
+
+  ui_test_utils::NavigateToURLWithDisposition(
+      browser(), spawned_test_server()->GetURL(kDebuggerTestPage),
+      WindowOpenDisposition::NEW_FOREGROUND_TAB,
+      ui_test_utils::BROWSER_TEST_WAIT_FOR_TAB |
+          ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
+  WebContents* second = browser()->tab_strip_model()->GetActiveWebContents();
+
+  scoped_refptr<content::DevToolsAgentHost> agent(
+      content::DevToolsAgentHost::GetOrCreateFor(second));
+  EXPECT_EQ("page", agent->GetType());
+
+  CloseDevToolsWindow();
+}
+
 IN_PROC_BROWSER_TEST_F(WorkerDevToolsSanityTest, InspectSharedWorker) {
   RunTest("testSharedWorker", kSharedWorkerTestPage, kSharedWorkerTestWorker);
 }
 
 // Flaky on multiple platforms. See http://crbug.com/432444
 IN_PROC_BROWSER_TEST_F(WorkerDevToolsSanityTest,
                        DISABLED_PauseInSharedWorkerInitialization) {
   ASSERT_TRUE(spawned_test_server()->Start());
   GURL url = spawned_test_server()->GetURL(kReloadSharedWorkerTestPage);
   ui_test_utils::NavigateToURL(browser(), url);
@@ skipping 204 matching lines @@
   RunTestFunction(window, "testWindowInitializedOnNavigateBack");
 
   DevToolsWindowTesting::CloseDevToolsWindowSync(window);
   content::WebUIControllerFactory::UnregisterFactoryForTesting(&test_factory);
 }
 
 // Tests scripts panel showing.
 IN_PROC_BROWSER_TEST_F(DevToolsSanityTest, TestDevToolsSharedWorker) {
   RunTest("testDevToolsSharedWorker", url::kAboutBlankURL);
 }