media: CdmFactory creates CDM (MediaKeys) asynchronously.

media/blink/encrypted_media_player_support.h

 // 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.
 
 #ifndef MEDIA_BLINK_ENCRYPTED_MEDIA_PLAYER_SUPPORT_H_
 #define MEDIA_BLINK_ENCRYPTED_MEDIA_PLAYER_SUPPORT_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 19 matching lines @@
 
 class MediaPermission;
 class WebContentDecryptionModuleImpl;
 
 // Provides support to prefixed EME implementation.
 // Do NOT add unprefixed EME functionality to this class!
 // TODO(xhwang): When deprecating prefixed EME support, drop this whole file.
 class EncryptedMediaPlayerSupport
     : public base::SupportsWeakPtr<EncryptedMediaPlayerSupport> {
  public:
-  typedef base::Callback<void(CdmContext*, const CdmAttachedCB&)>
-      SetCdmContextCB;
+  using SetCdmContextCB = ProxyDecryptor::SetCdmContextCB;
 
+  // |set_cdm_context_cb| is called when the real CDM is created successfully.

[ddorwin, 2015/04/10 00:59:43]

"real"? Is there a fake/stub/temporary one?

"CDM instance"?

[xhwang, 2015/04/10 17:41:17]

Done.

   EncryptedMediaPlayerSupport(CdmFactory* cdm_factory,
                               blink::WebMediaPlayerClient* client,
                               MediaPermission* media_permission,
                               const SetCdmContextCB& set_cdm_context_cb);
   ~EncryptedMediaPlayerSupport();
 
   blink::WebMediaPlayer::MediaKeyException GenerateKeyRequest(
       blink::WebLocalFrame* frame,
       const blink::WebString& key_system,
       const unsigned char* init_data,
@@ skipping 60 matching lines @@
 
   // Manages decryption keys and decrypts encrypted frames.
   scoped_ptr<ProxyDecryptor> proxy_decryptor_;
 
   DISALLOW_COPY_AND_ASSIGN(EncryptedMediaPlayerSupport);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_ENCRYPTED_MEDIA_PLAYER_SUPPORT_H_