Mojo: Add the beginnings of a proper embedder API.

mojo/mojo.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     'mojo_apps.gypi',
@@ skipping 76 matching lines @@
         'system/core_impl.cc',
         'system/core_impl.h',
         'system/data_pipe.cc',
         'system/data_pipe.h',
         'system/data_pipe_consumer_dispatcher.cc',
         'system/data_pipe_consumer_dispatcher.h',
         'system/data_pipe_producer_dispatcher.cc',
         'system/data_pipe_producer_dispatcher.h',
         'system/dispatcher.cc',
         'system/dispatcher.h',
+        'system/embedder.cc',
+        'system/embedder.h',
         'system/local_data_pipe.cc',
         'system/local_data_pipe.h',
         'system/local_message_pipe_endpoint.cc',
         'system/local_message_pipe_endpoint.h',
         'system/memory.cc',
         'system/memory.h',
         'system/message_in_transit.cc',
         'system/message_in_transit.h',
         'system/message_pipe.cc',
         'system/message_pipe.h',
@@ skipping 313 matching lines @@
             'java_in_dir': '<(DEPTH)/mojo/shell/android/apk',
             'resource_dir': '<(DEPTH)/mojo/shell/android/apk/res',
             'native_lib_target': 'libmojo_shell',
           },
           'includes': [ '../build/java_apk.gypi' ],
         }
       ],
     }],
   ],
 }