Add --auto-open-devtools-for-tabs flag.

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 "base/bind.h"
 #include "base/cancelable_callback.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
@@ skipping 1007 matching lines @@
   ASSERT_TRUE(
       content::ExecuteScriptAndExtractString(
           main_web_contents()->GetRenderViewHost(),
           "window.domAutomationController.send("
           "    '' + (window.uiTests && (typeof uiTests.dispatchOnTestSuite)));",
           &result));
   ASSERT_EQ("function", result) << "DevTools front-end is broken.";
   CloseDevToolsWindow();
 }
 
+class DevToolsAutoOpenerTest : public DevToolsSanityTest {
+ public:
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    command_line->AppendSwitch(switches::kAutoOpenDevToolsForTabs);
+  }
+};
+
+IN_PROC_BROWSER_TEST_F(DevToolsAutoOpenerTest, TestAutoOpenForTabs) {
+  {
+    scoped_refptr<content::DevToolsAgentHost> agent(
+        content::DevToolsAgentHost::GetOrCreateFor(GetInspectedTab()));
+    DevToolsWindow* window = DevToolsWindow::FindDevToolsWindow(agent.get());
+    ASSERT_TRUE(window);
+    DevToolsWindowTesting::CloseDevToolsWindowSync(window);
+  }
+  {
+    DevToolsWindowCreationObserver observer;
+    AddTabAtIndexToBrowser(browser(), 0, GURL("about:blank"),
+        ui::PAGE_TRANSITION_AUTO_TOPLEVEL, false);
+    observer.WaitForLoad();
+    DevToolsWindowTesting::CloseDevToolsWindowSync(observer.devtools_window());
+  }
+  {
+    DevToolsWindowCreationObserver observer;
+    Browser* new_browser = CreateBrowser(browser()->profile());
+    AddTabAtIndexToBrowser(new_browser, 0, GURL("about:blank"),
+        ui::PAGE_TRANSITION_AUTO_TOPLEVEL, false);
+    observer.WaitForLoad();
+    DevToolsWindowTesting::CloseDevToolsWindowSync(observer.devtools_window());
+  }
+}
+
 class DevToolsReattachAfterCrashTest : public DevToolsSanityTest {
  protected:
   void RunTestWithPanel(const char* panel_name) {
     OpenDevToolsWindow("about:blank", false);
     SwitchToPanel(window_, panel_name);
     ui_test_utils::NavigateToURL(browser(), GURL(url::kAboutBlankURL));
 
     content::RenderProcessHostWatcher crash_observer(
         GetInspectedTab(),
         content::RenderProcessHostWatcher::WATCH_FOR_PROCESS_EXIT);
@@ skipping 172 matching lines @@
 
   SimulateTapAt(web_contents, gfx::Point(30, 60));
   DispatchInPageAndWait("waitForEvent", "gesturetap");
 
   DispatchAndWait("stopTimeline");
   RunTestMethod("checkInputEventsPresent", "MouseMove", "MouseDown",
                 "MouseWheel", "GestureTap");
 
   CloseDevToolsWindow();
 }