Add a JavaScript dialog tab helper.

chrome/browser/ui/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
 import("//media/media_options.gni")
@@ skipping 85 matching lines @@
     "confirm_bubble.h",
     "crypto_module_password_dialog.h",
     "find_bar/find_bar.h",
     "find_bar/find_bar_state.h",
     "find_bar/find_bar_state_factory.cc",
     "find_bar/find_bar_state_factory.h",
     "find_bar/find_notification_details.h",
     "find_bar/find_tab_helper.cc",
     "find_bar/find_tab_helper.h",
     "javascript_dialogs/chrome_javascript_native_dialog_factory.h",
+    "javascript_dialogs/javascript_dialog_tab_helper.cc",
+    "javascript_dialogs/javascript_dialog_tab_helper.h",
     "login/login_handler.cc",
     "login/login_handler.h",
     "login/login_interstitial_delegate.cc",
     "login/login_interstitial_delegate.h",
     "media_utils.cc",
     "media_utils.h",
     "navigation_correction_tab_observer.cc",
     "navigation_correction_tab_observer.h",
     "passwords/account_avatar_fetcher.cc",
     "passwords/account_avatar_fetcher.h",
@@ skipping 3262 matching lines @@
       "passwords/passwords_model_delegate_mock.cc",
       "passwords/passwords_model_delegate_mock.h",
     ]
     deps += [ "//chrome/test:test_support_ui" ]
   }
 
   if (enable_extensions) {
     deps += [ "//extensions/browser" ]
   }
 }