Add OnLegacySessionError() in CDM_7.

content_decryption_module.h

 // Copyright (c) 2012 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 CDM_CONTENT_DECRYPTION_MODULE_H_
 #define CDM_CONTENT_DECRYPTION_MODULE_H_
 
 #if defined(_MSC_VER)
 typedef unsigned char uint8_t;
 typedef unsigned int uint32_t;
@@ skipping 1013 matching lines @@
   // null termination.
   virtual void OnExpirationChange(const char* session_id,
                                   uint32_t session_id_size,
                                   Time new_expiry_time) = 0;
 
   // Called by the CDM when session |session_id| is closed. Size
   // parameter should not include null termination.
   virtual void OnSessionClosed(const char* session_id,
                                uint32_t session_id_size) = 0;
 
+  // Called by the CDM when an error occurs in session |session_id|
+  // unrelated to one of the ContentDecryptionModule calls that accept a
+  // |promise_id|. |error| must be specified, |error_message| and
+  // |system_code| are optional. Length parameters should not include null
+  // termination.
+  // Note:
+  // - This method is only for supporting prefixed EME API.
+  // - This method will be ignored by unprefixed EME. All errors reported
+  //   in this method should probably also be reported by one of other methods.
+  virtual void OnLegacySessionError(
+      const char* session_id, uint32_t session_id_length,
+      Error error,
+      uint32_t system_code,
+      const char* error_message, uint32_t error_message_length) = 0;
+
   // The following are optional methods that may not be implemented on all
   // platforms.
 
   // Sends a platform challenge for the given |service_id|. |challenge| is at
   // most 256 bits of data to be signed. Once the challenge has been completed,
   // the host will call ContentDecryptionModule::OnPlatformChallengeResponse()
   // with the signed challenge response and platform certificate. Size
   // parameters should not include null termination.
   virtual void SendPlatformChallenge(const char* service_id,
                                      uint32_t service_id_size,
@@ skipping 97 matching lines @@
   virtual AudioFormat Format() const = 0;
 
  protected:
   AudioFrames() {}
   virtual ~AudioFrames() {}
 };
 
 }  // namespace cdm
 
 #endif  // CDM_CONTENT_DECRYPTION_MODULE_H_