Add UMA to report requests for key systems using RequestMediaKeyAccess

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 "media/base/cdm_factory.h"
 #include "media/base/media_export.h"
 #include "third_party/WebKit/public/platform/WebEncryptedMediaClient.h"
 #include "third_party/WebKit/public/web/WebSecurityOrigin.h"
 
 namespace media {
 
 class MEDIA_EXPORT WebEncryptedMediaClientImpl
     : public blink::WebEncryptedMediaClient {
  public:
   WebEncryptedMediaClientImpl(scoped_ptr<CdmFactory> cdm_factory);
   virtual ~WebEncryptedMediaClientImpl();
 
   // WebEncryptedMediaClient implementation.
   virtual void requestMediaKeySystemAccess(
       blink::WebEncryptedMediaRequest request);
 
  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_;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_WEBENCRYPTEDMEDIACLIENT_IMPL_H_