Add ProxyDecryptor which wraps concrete Decryptor implementations.

webkit/media/webkit_media.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.
 
 {
   'targets': [
     {
       'target_name': 'webkit_media',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 14 matching lines @@
         'active_loader.cc',
         'active_loader.h',
         'audio_decoder.cc',
         'audio_decoder.h',
         'buffered_data_source.cc',
         'buffered_data_source.h',
         'buffered_resource_loader.cc',
         'buffered_resource_loader.h',
         'cache_util.cc',
         'cache_util.h',
+        'crypto/key_systems.cc',
+        'crypto/key_systems.h',
+        'crypto/proxy_decryptor.cc',
+        'crypto/proxy_decryptor.h',
         'filter_helpers.cc',
         'filter_helpers.h',
-        'key_systems.cc',
-        'key_systems.h',
         'media_stream_client.h',
         'preload.h',
         'skcanvas_video_renderer.cc',
         'skcanvas_video_renderer.h',
         'webmediaplayer_delegate.h',
         'webmediaplayer_impl.cc',
         'webmediaplayer_impl.h',
         'webmediaplayer_proxy.cc',
         'webmediaplayer_proxy.h',
         'webmediaplayer_util.cc',
@@ skipping 18 matching lines @@
           ],
         }, { # OS != "android"'
           'sources/': [
             ['exclude', '^android/'],
           ],
         }],
       ],
     },
   ],
 }