Encrypted Media: Implement IPC based SetCdm().

media/base/media_keys.h

 // 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.
 
 #ifndef MEDIA_BASE_MEDIA_KEYS_H_
 #define MEDIA_BASE_MEDIA_KEYS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 20 matching lines @@
     kClientError,
     // The commented v0.1b values below have never been used.
     // kServiceError,
     kOutputError = 4,
     // kHardwareChangeError,
     // kDomainError,
     kMaxKeyError  // Must be last and greater than any legit value.
   };
 
   const static uint32 kInvalidSessionId = 0;
+  const static int kInvalidCdmId = -1;
 
   MediaKeys();
   virtual ~MediaKeys();
 
   // Creates a session with the |content_type| and |init_data| provided.
   // Returns true if a session is successfully created, false otherwise.
   // Note: UpdateSession() and ReleaseSession() should only be called after
   // SessionCreatedCB is fired.
   // TODO(jrummell): Remove return value when prefixed API is removed.
   // See http://crbug.com/342510
@@ skipping 14 matching lines @@
                              int response_length) = 0;
 
   // Releases the session specified by |session_id|.
   virtual void ReleaseSession(uint32 session_id) = 0;
 
   // Gets the Decryptor object associated with the MediaKeys. Returns NULL if
   // no Decryptor object is associated. The returned object is only guaranteed
   // to be valid during the MediaKeys' lifetime.
   virtual Decryptor* GetDecryptor();
 
+  // Gets the CDM ID associated with the MediaKeys. Returns kInvalidCdmId if no
+  // CDM ID is associated.
+  virtual int GetCdmId();

[ddorwin, 2014/03/11 04:06:33]

Too bad this has to be on the main interface. :(

[ddorwin, 2014/03/11 18:05:14]

As discussed, I think we can avoid this.

[xhwang, 2014/03/12 01:07:52]

Removed.

+
  private:
   DISALLOW_COPY_AND_ASSIGN(MediaKeys);
 };
 
 // Key event callbacks. See the spec for details:
 // https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html#event-summary
 typedef base::Callback<
     void(uint32 session_id, const std::string& web_session_id)>
     SessionCreatedCB;
 
 typedef base::Callback<void(uint32 session_id,
                             const std::vector<uint8>& message,
                             const std::string& destination_url)>
     SessionMessageCB;
 
 typedef base::Callback<void(uint32 session_id)> SessionReadyCB;
 
 typedef base::Callback<void(uint32 session_id)> SessionClosedCB;
 
 typedef base::Callback<void(uint32 session_id,
                             media::MediaKeys::KeyError error_code,
                             uint32 system_code)> SessionErrorCB;
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MEDIA_KEYS_H_