Add UMA reporting to CdmPromise.

content/renderer/media/cdm_session_adapter.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 CONTENT_RENDERER_MEDIA_CDM_SESSION_ADAPTER_H_
 #define CONTENT_RENDERER_MEDIA_CDM_SESSION_ADAPTER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 70 matching lines @@
   // Takes ownership of |promise|.
   void ReleaseSession(const std::string& web_session_id,
                       scoped_ptr<media::SimpleCdmPromise> promise);
 
   // Returns the Decryptor associated with this CDM. May be NULL if no
   // Decryptor is associated with the MediaKeys object.
   // TODO(jrummell): Figure out lifetimes, as WMPI may still use the decryptor
   // after WebContentDecryptionModule is freed. http://crbug.com/330324
   media::Decryptor* GetDecryptor();
 
+  // Returns a prefix to use for UMAs.
+  const std::string& GetKeySystemUMAPrefix() const;
+
 #if defined(ENABLE_BROWSER_CDMS)
   // Returns the CDM ID associated with the |media_keys_|. May be kInvalidCdmId
   // if no CDM ID is associated.
   int GetCdmId() const;
 #endif
 
  private:
   friend class base::RefCounted<CdmSessionAdapter>;
   typedef base::hash_map<std::string,
                          base::WeakPtr<WebContentDecryptionModuleSessionImpl> >
@@ skipping 17 matching lines @@
       const std::string& web_session_id);
 
   scoped_ptr<media::MediaKeys> media_keys_;
 
   SessionMap sessions_;
 
 #if defined(ENABLE_BROWSER_CDMS)
   int cdm_id_;
 #endif
 
+  std::string key_system_uma_prefix_;
+
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<CdmSessionAdapter> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CdmSessionAdapter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_CDM_SESSION_ADAPTER_H_