Add a hang monitor for Pepper plugins

content/content_renderer.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.
 
 {
   'dependencies': [
     '../jingle/jingle.gyp:jingle_glue',
     '../net/net.gyp:net',
     '../ppapi/ppapi_internal.gyp:ppapi_proxy',
     '../ppapi/ppapi_internal.gyp:ppapi_shared',
@@ skipping 105 matching lines @@
     'renderer/mouse_lock_dispatcher.cc',
     'renderer/mouse_lock_dispatcher.h',
     'renderer/notification_provider.cc',
     'renderer/notification_provider.h',
     'renderer/paint_aggregator.cc',
     'renderer/paint_aggregator.h',
     'renderer/pepper/pepper_broker_impl.cc',
     'renderer/pepper/pepper_broker_impl.h',
     'renderer/pepper/pepper_device_enumeration_event_handler.cc',
     'renderer/pepper/pepper_device_enumeration_event_handler.h',
+    'renderer/pepper/pepper_hung_plugin_filter.cc',
+    'renderer/pepper/pepper_hung_plugin_filter.h',
     'renderer/pepper/pepper_parent_context_provider.cc',
     'renderer/pepper/pepper_parent_context_provider.h',
     'renderer/pepper/pepper_platform_audio_input_impl.cc',
     'renderer/pepper/pepper_platform_audio_input_impl.h',
     'renderer/pepper/pepper_platform_audio_output_impl.cc',
     'renderer/pepper/pepper_platform_audio_output_impl.h',
     'renderer/pepper/pepper_platform_context_3d_impl.cc',
     'renderer/pepper/pepper_platform_context_3d_impl.h',
     'renderer/pepper/pepper_platform_image_2d_impl.cc',
     'renderer/pepper/pepper_platform_image_2d_impl.h',
@@ skipping 146 matching lines @@
     }, {
       'sources!': [
         'renderer/java/java_bridge_channel.cc',
         'renderer/java/java_bridge_channel.h',
         'renderer/java/java_bridge_dispatcher.cc',
         'renderer/java/java_bridge_dispatcher.h',
       ],
     }],
   ],
 }