Add a hang monitor for Pepper plugins

chrome/chrome_browser.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 3040 matching lines @@
         'browser/ui/gtk/unity_service.cc',
         'browser/ui/gtk/unity_service.h',
         'browser/ui/gtk/update_recommended_dialog.cc',
         'browser/ui/gtk/update_recommended_dialog.h',
         'browser/ui/gtk/view_id_util.cc',
         'browser/ui/gtk/view_id_util.h',
         'browser/ui/gtk/web_intent_picker_gtk.cc',
         'browser/ui/gtk/web_intent_picker_gtk.h',
         'browser/ui/gtk/website_settings_popup_gtk.cc',
         'browser/ui/gtk/website_settings_popup_gtk.h',
+        'browser/ui/hung_plugin_tab_helper.cc',
+        'browser/ui/hung_plugin_tab_helper.h',
         'browser/ui/intents/web_intent_inline_disposition_delegate.cc',
         'browser/ui/intents/web_intent_inline_disposition_delegate.h',
         'browser/ui/intents/web_intent_picker.cc',
         'browser/ui/intents/web_intent_picker.h',
         'browser/ui/intents/web_intent_picker_controller.cc',
         'browser/ui/intents/web_intent_picker_controller.h',
         'browser/ui/intents/web_intent_picker_delegate.h',
         'browser/ui/intents/web_intent_picker_model.cc',
         'browser/ui/intents/web_intent_picker_model.h',
         'browser/ui/intents/web_intent_picker_model_observer.h',
@@ skipping 2164 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/history/in_memory_url_index_cache.proto' ],
       'variables': {
         'proto_in_dir': 'browser/history',
         'proto_out_dir': 'chrome/browser/history',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }