Introduces DevToolsManagerDelegate.

chrome/browser/chrome_browser_main.cc

Index: chrome/browser/chrome_browser_main.cc
diff --git a/chrome/browser/chrome_browser_main.cc b/chrome/browser/chrome_browser_main.cc
index d84585d1cdef1629afad49d2ab019c8f900cff10..80631fce17027e31fed03025dc6a178a53b749b1 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -50,6 +50,7 @@
 #include "chrome/browser/component_updater/swiftshader_component_installer.h"
 #include "chrome/browser/component_updater/widevine_cdm_component_installer.h"
 #include "chrome/browser/defaults.h"
+#include "chrome/browser/devtools/devtools_window.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/startup_helper.h"
 #include "chrome/browser/feedback/feedback_profile_observer.h"
@@ -116,6 +117,7 @@
 #include "components/startup_metric_utils/startup_metric_utils.h"
 #include "components/translate/core/browser/translate_download_manager.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/browser/devtools_manager.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
@@ -1253,8 +1255,12 @@ int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
   content::WebUIControllerFactory::RegisterFactory(
       ChromeWebUIControllerFactory::GetInstance());
 
-  // NaClBrowserDelegateImpl is accessed inside PostProfileInit().
-  // So make sure to create it before that.
+  content::DevToolsManager::GetInstance()
+      ->RegisterOpenDevToolsWindowForWorkerCallback(
+          DevToolsWindow::GetOpenDevToolsWindowForWorkerCallback());
+
+// NaClBrowserDelegateImpl is accessed inside PostProfileInit().
+// So make sure to create it before that.
 #if !defined(DISABLE_NACL)
   NaClBrowserDelegateImpl* delegate = new NaClBrowserDelegateImpl(
     extensions::ExtensionSystem::Get(profile_)->info_map());