Implement BrowserPluginPlaceholder.

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 125 matching lines @@
     'renderer/pepper/pepper_platform_image_2d_impl.cc',
     'renderer/pepper/pepper_platform_image_2d_impl.h',
     'renderer/pepper/pepper_platform_video_capture_impl.cc',
     'renderer/pepper/pepper_platform_video_capture_impl.h',
     'renderer/pepper/pepper_plugin_delegate_impl.cc',
     'renderer/pepper/pepper_plugin_delegate_impl.h',
     'renderer/pepper/pepper_proxy_channel_delegate_impl.cc',
     'renderer/pepper/pepper_proxy_channel_delegate_impl.h',
     'renderer/plugin_channel_host.cc',
     'renderer/plugin_channel_host.h',
+    'renderer/browser_plugin/browser_plugin_constants.cc',
+    'renderer/browser_plugin/browser_plugin_constants.h',
+    'renderer/browser_plugin/browser_plugin_placeholder.cc',
+    'renderer/browser_plugin/browser_plugin_placeholder.h',
     'renderer/render_process.h',
     'renderer/render_process_impl.cc',
     'renderer/render_process_impl.h',
     'renderer/render_thread_impl.cc',
     'renderer/render_thread_impl.h',
     'renderer/render_view_impl.cc',
     'renderer/render_view_impl.h',
     'renderer/render_view_linux.cc',
     'renderer/render_view_selection.cc',
     'renderer/render_view_selection.h',
@@ skipping 122 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',
       ],
     }],
   ],
 }