Handle createCDM() when frame destroyed

media/blink/webencryptedmediaclient_impl.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_WEBENCRYPTEDMEDIACLIENT_IMPL_H_
 #define MEDIA_BLINK_WEBENCRYPTEDMEDIACLIENT_IMPL_H_
 
 #include <string>
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "media/base/cdm_factory.h"
 #include "media/base/media_export.h"
+#include "third_party/WebKit/public/platform/WebContentDecryptionModuleResult.h"
 #include "third_party/WebKit/public/platform/WebEncryptedMediaClient.h"
 #include "third_party/WebKit/public/web/WebSecurityOrigin.h"
 
 namespace media {
 
 class MediaPermission;
 
 class MEDIA_EXPORT WebEncryptedMediaClientImpl
     : public blink::WebEncryptedMediaClient {
  public:
   WebEncryptedMediaClientImpl(scoped_ptr<CdmFactory> cdm_factory,
                               MediaPermission* media_permission);
   virtual ~WebEncryptedMediaClientImpl();
 
   // WebEncryptedMediaClient implementation.
   virtual void requestMediaKeySystemAccess(
       blink::WebEncryptedMediaRequest request);
 
+  // Create the CDM for |key_system| and |security_origin|. The caller owns
+  // the created cdm (passed back using |result|).
+  void CreateCdm(const blink::WebString& key_system,
+                 const blink::WebSecurityOrigin& security_origin,
+                 blink::WebContentDecryptionModuleResult result);
+
  private:
   // Report usage of key system to UMA. There are 2 different counts logged:
   // 1. The key system is requested.
   // 2. The requested key system and options are supported.
   // Each stat is only reported once per renderer frame per key system.
   class Reporter;
 
   // Gets the Reporter for |key_system|. If it doesn't already exist,
   // create one.
   Reporter* GetReporter(const std::string& key_system);
 
   // Key system <-> Reporter map.
   typedef base::ScopedPtrHashMap<std::string, Reporter> Reporters;
   Reporters reporters_;
 
   scoped_ptr<CdmFactory> cdm_factory_;
+
+  base::WeakPtrFactory<WebEncryptedMediaClientImpl> weak_factory_;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_WEBENCRYPTEDMEDIACLIENT_IMPL_H_