Add CdmService to keep track of CDMs

content/content_common.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': [
     '../base/base.gyp:base',
     '../components/tracing.gyp:tracing',
     '../gpu/command_buffer/command_buffer.gyp:gles2_utils',
     '../net/net.gyp:net',
@@ skipping 66 matching lines @@
       'public/common/file_chooser_params.h',
       'public/common/frame_navigate_params.cc',
       'public/common/frame_navigate_params.h',
       'public/common/geoposition.cc',
       'public/common/geoposition.h',
       'public/common/gpu_memory_stats.cc',
       'public/common/gpu_memory_stats.h',
       'public/common/injection_test_mac.h',
       'public/common/injection_test_win.h',
       'public/common/javascript_message_type.h',
+      'public/common/key_system_registration.h',
+      'public/common/key_system_service.h',
       'public/common/main_function_params.h',
       'public/common/manifest.cc',
       'public/common/manifest.h',
       'public/common/media_metadata.cc',
       'public/common/media_metadata.h',
       'public/common/media_stream_request.cc',
       'public/common/media_stream_request.h',
       'public/common/menu_item.cc',
       'public/common/menu_item.h',
       'public/common/message_port_types.cc',
@@ skipping 331 matching lines @@
       'common/mac/attributed_string_coder.mm',
       'common/mac/font_descriptor.h',
       'common/mac/font_descriptor.mm',
       'common/mac/font_loader.h',
       'common/mac/font_loader.mm',
       'common/manifest_manager_messages.h',
       'common/media/aec_dump_messages.h',
       'common/media/audio_messages.h',
       'common/media/cdm_messages.h',
       'common/media/cdm_messages_enums.h',
+      'common/media/key_system_service.cc',
       'common/media/media_param_traits.cc',
       'common/media/media_param_traits.h',
       'common/media/media_player_messages_android.h',
       'common/media/media_session_messages_android.h',
       'common/media/media_stream_messages.h',
       'common/media/media_stream_options.cc',
       'common/media/media_stream_options.h',
       'common/media/media_stream_track_metrics_host_messages.h',
       'common/media/midi_messages.h',
       'common/media/video_capture.h',
@@ skipping 670 matching lines @@
         'common/gpu/client/gpu_memory_buffer_impl_ozone.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.h',
         'common/gpu/gpu_memory_buffer_factory_ozone.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_pixmap.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_pixmap.h',
       ],
     }],
   ],
 }