Implement checks for distinctiveIdentifier and persistentState in requestMediaKeySystemAccess().

components/cdm/renderer/android_key_systems.cc

 // 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.
 
 #include "components/cdm/renderer/android_key_systems.h"
 
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 57 matching lines @@
       info.supported_codecs = response.compositing_codecs;
       // Here we assume that support for a container implies support for the
       // associated initialization data type. KeySystems handles validating
       // |init_data_type| x |container| pairings.
       if (response.compositing_codecs & media::EME_CODEC_WEBM_ALL)
         info.supported_init_data_types |= media::EME_INIT_DATA_TYPE_WEBM;
 #if defined(USE_PROPRIETARY_CODECS)
       if (response.compositing_codecs & media::EME_CODEC_MP4_ALL)
         info.supported_init_data_types |= media::EME_INIT_DATA_TYPE_CENC;
 #endif  // defined(USE_PROPRIETARY_CODECS)
+      // Prevent creation thorugh the requestMediaKeySystemAccess() API.

[jrummell, 2015/02/14 01:28:35]

s/thorugh/through/

[ddorwin, 2015/02/17 20:56:46]

Until https://github.com/w3c/encrypted-media/issues/29 is implemented, this does
not actually affect requestMediaKeySystemAccess(), right?

Is the goal to prevent use of platform key systems with unprefixed EME? If so,
maybe we should be clearer about this or handle it differently. Let's discuss.

[sandersd (OOO until July 31), 2015/02/18 23:41:17]

Previously there was a specific check for this, but it's been removed in this
patch set. Is there something more we should be doing? (I'm assuming it's not
necessary since you are disabling unprefixed on the relevant platforms.)

[sandersd (OOO until July 31), 2015/02/18 23:41:17]

Done.

+      info.supported_session_types = media::EME_SESSION_TYPE_NONE;
       concrete_key_systems->push_back(info);
     }
   }
 }
 
 }  // namespace cdm