media: Reject pending CDM promise during destruction.

media/blink/cdm_result_promise.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_CDM_RESULT_PROMISE_H_
 #define MEDIA_BLINK_CDM_RESULT_PROMISE_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 38 matching lines @@
 
 template <typename... T>
 CdmResultPromise<T...>::CdmResultPromise(
     const blink::WebContentDecryptionModuleResult& result,
     const std::string& uma_name)
     : web_cdm_result_(result), uma_name_(uma_name) {
 }
 
 template <typename... T>
 CdmResultPromise<T...>::~CdmResultPromise() {
+  if (web_cdm_result_.isCompleted())
+    return;
+
+  std::string message =
+      "Unfulfilled promise rejected automatically during destruction.";
+  DVLOG(1) << message;
+  reject(MediaKeys::INVALID_STATE_ERROR, 0, message);
 }
 
 // "inline" is needed to prevent multiple definition error.
 
 template <>
 inline void CdmResultPromise<>::resolve() {
   MarkPromiseSettled();
   ReportCdmResultUMA(uma_name_, SUCCESS);
   web_cdm_result_.complete();
 }
 
 template <typename... T>
 void CdmResultPromise<T...>::reject(media::MediaKeys::Exception exception_code,
                                     uint32_t system_code,
                                     const std::string& error_message) {
   MarkPromiseSettled();
   ReportCdmResultUMA(uma_name_,
                      ConvertCdmExceptionToResultForUMA(exception_code));
   web_cdm_result_.completeWithError(ConvertCdmException(exception_code),
                                     system_code,
                                     blink::WebString::fromUTF8(error_message));
 }
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_CDM_RESULT_PROMISE_H_