Add history popup when long pressing on the back key.

chrome/chrome_browser_ui.gypi

 # Copyright 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_ui',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 64 matching lines @@
         'browser/ui/android/autofill/autofill_popup_view_android.h',
         'browser/ui/android/certificate_viewer_android.cc',
         'browser/ui/android/chrome_http_auth_handler.cc',
         'browser/ui/android/chrome_http_auth_handler.h',
         'browser/ui/android/extensions/extension_install_dialog_android.cc',
         'browser/ui/android/extensions/extension_view_android.cc',
         'browser/ui/android/extensions/extension_view_android.h',
         'browser/ui/android/external_protocol_dialog_android.cc',
         'browser/ui/android/javascript_app_modal_dialog_android.cc',
         'browser/ui/android/login_prompt_android.cc',
+        'browser/ui/android/navigation_popup.cc',
+        'browser/ui/android/navigation_popup.h',
         'browser/ui/android/simple_message_box_android.cc',
         'browser/ui/android/ssl_client_certificate_selector.cc',
         'browser/ui/android/status_tray_android.cc',
         'browser/ui/android/tab_contents/chrome_web_contents_view_delegate_android.cc',
         'browser/ui/android/tab_contents/chrome_web_contents_view_delegate_android.h',
         'browser/ui/android/tab_model/tab_model.cc',
         'browser/ui/android/tab_model/tab_model.h',
         'browser/ui/android/tab_model/tab_model_list.cc',
         'browser/ui/android/tab_model/tab_model_list.h',
         'browser/ui/android/tab_restore_service_delegate_android.cc',
@@ skipping 2697 matching lines @@
         }, { # else: enable_app_list==0
           'sources/': [
             ['exclude', '^browser/ui/views/app_list/'],
             ['exclude', '^browser/ui/app_list/'],
           ]
         }],
       ],
     },
   ],
 }