Support LoadSession() in MediaKeys and PPP_ContentDecryptor_Private interface.

content/renderer/media/crypto/proxy_decryptor.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 CONTENT_RENDERER_MEDIA_CRYPTO_PROXY_DECRYPTOR_H_
 #define CONTENT_RENDERER_MEDIA_CRYPTO_PROXY_DECRYPTOR_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 87 matching lines @@
   void OnSessionMessage(uint32 session_id,
                         const std::vector<uint8>& message,
                         const std::string& default_url);
   void OnSessionReady(uint32 session_id);
   void OnSessionClosed(uint32 session_id);
   void OnSessionError(uint32 session_id,
                       media::MediaKeys::KeyError error_code,
                       int system_code);
 
   // Helper function to determine session_id for the provided |web_session_id|.
-  uint32 LookupSessionId(const std::string& web_session_id);
+  uint32 LookupSessionId(const std::string& web_session_id) const;
 
   // Helper function to determine web_session_id for the provided |session_id|.
   // The returned web_session_id is only valid on the main thread, and should be
   // stored by copy.
-  const std::string& LookupWebSessionId(uint32 session_id);
+  const std::string& LookupWebSessionId(uint32 session_id) const;
 
   base::WeakPtrFactory<ProxyDecryptor> weak_ptr_factory_;
 
 #if defined(ENABLE_PEPPER_CDMS)
   // Callback for cleaning up a Pepper-based CDM.
   void DestroyHelperPlugin();
 
   // Needed to create the PpapiDecryptor.
   blink::WebMediaPlayerClient* web_media_player_client_;
   blink::WebFrame* web_frame_;
@@ skipping 18 matching lines @@
   SessionIdMap sessions_;
 
   bool is_clear_key_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyDecryptor);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_CRYPTO_PROXY_DECRYPTOR_H_