Add some remoting targets to GN build.

remoting/remoting_client.gypi

 # Copyright 2014 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': [
     {
+      # GN version: //remoting/client/plugin
       'target_name': 'remoting_client_plugin',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
       'defines': [
         'HAVE_STDINT_H',  # Required by on2_integer.h
       ],
       'dependencies': [
         '../net/net.gyp:net',
         '../ppapi/ppapi.gyp:ppapi_cpp_objects',
         '../ppapi/ppapi.gyp:ppapi_internal_module',
         '../third_party/webrtc/modules/modules.gyp:desktop_capture',
         '../ui/events/events.gyp:dom4_keycode_converter',
         'remoting_base',
         'remoting_client',
         'remoting_protocol',
       ],
       'sources': [
         '<@(remoting_client_plugin_sources)',
         'client/plugin/pepper_entrypoints.cc',
         'client/plugin/pepper_entrypoints.h',
       ],
     },  # end of target 'remoting_client_plugin'
 
     {
+      # GN version: //remoting/client
       'target_name': 'remoting_client',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
       'defines': [
         'VERSION=<(version_full)',
       ],
       'dependencies': [
         'remoting_base',
         'remoting_protocol',
         '../third_party/libyuv/libyuv.gyp:libyuv',
         '../third_party/webrtc/modules/modules.gyp:desktop_capture',
         '../third_party/libwebm/libwebm.gyp:libwebm',
       ],
       'sources': [
         '<@(remoting_client_sources)',
       ],
     },  # end of target 'remoting_client'
 
     {
       'target_name': 'remoting_webapp_html',
       'type': 'none',
       'actions': [
         {
+          # GN version: //remoting/webapp:html
           'action_name': 'Build Remoting Webapp main.html',
           'inputs': [
             'webapp/build-html.py',
             '<(remoting_webapp_template_main)',
             '<@(remoting_webapp_template_files)',
           ],
           'outputs': [
             '<(SHARED_INTERMEDIATE_DIR)/main.html',
           ],
           'action': [
@@ skipping 81 matching lines @@
         }, {
           'variables': {
             'webapp_type': 'v2',
           },
         }],
       ],
       'includes': [ 'remoting_webapp.gypi', ],
     },  # end of target 'remoting_webapp_v2'
   ],  # end of targets
 }