Add a RenderProcessObserver. For now this will be primarily used to filter control messages, so ...

content/content_renderer.gypi

 # Copyright (c) 2011 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': 'content_renderer',
       'msvs_guid': '9AAA8CF2-9B3D-4895-8CB9-D70BBD125EAD',
       'type': '<(library)',
@@ skipping 59 matching lines @@
         'renderer/p2p/socket_dispatcher.cc',
         'renderer/p2p/socket_dispatcher.h',
         'renderer/paint_aggregator.cc',
         'renderer/paint_aggregator.h',
         'renderer/pepper_platform_context_3d_impl.cc',
         'renderer/pepper_platform_context_3d_impl.h',
         'renderer/pepper_plugin_delegate_impl.cc',
         'renderer/pepper_plugin_delegate_impl.h',
         'renderer/plugin_channel_host.cc',
         'renderer/plugin_channel_host.h',
+        'renderer/render_process_observer.cc',
+        'renderer/render_process_observer.h',
         'renderer/render_view.cc',
         'renderer/render_view.h',
         'renderer/render_view_linux.cc',
         'renderer/render_view_observer.cc',
         'renderer/render_view_observer.h',
         'renderer/render_view_visitor.h',
         'renderer/render_widget.cc',
         'renderer/render_widget.h',
         'renderer/render_widget_fullscreen.cc',
         'renderer/render_widget_fullscreen.h',
@@ skipping 64 matching lines @@
           'link_settings': {
             'mac_bundle_resources': [
               'renderer/renderer.sb',
             ],
           },
         }],
       ],
     },
   ],
 }