Update PluginInstance for decrypt-and-decode video.

ppapi/cpp/private/content_decryptor_private.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 PPAPI_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_
 #define PPAPI_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_
 
 #include "ppapi/c/private/pp_content_decryptor.h"
 #include "ppapi/c/private/ppb_content_decryptor_private.h"
 #include "ppapi/c/private/ppp_content_decryptor_private.h"
@@ skipping 25 matching lines @@
   virtual void CancelKeyRequest(const std::string& session_id) = 0;
   virtual void Decrypt(pp::Buffer_Dev encrypted_buffer,
                        const PP_EncryptedBlockInfo& encrypted_block_info) = 0;
   virtual void InitializeVideoDecoder(
       const PP_VideoDecoderConfig& decoder_config,
       pp::Buffer_Dev extra_data_resource) = 0;
   virtual void DeinitializeDecoder(PP_DecryptorStreamType decoder_type,
                                    uint32_t request_id) = 0;
   virtual void ResetDecoder(PP_DecryptorStreamType decoder_type,
                             uint32_t request_id) = 0;
+  // Null |encrypted_frame| means end-of-stream buffer.
   virtual void DecryptAndDecode(
       PP_DecryptorStreamType decoder_type,
       pp::Buffer_Dev encrypted_buffer,
       const PP_EncryptedBlockInfo& encrypted_block_info) = 0;
 
   // PPB_ContentDecryptor_Private methods for passing data from the decryptor
   // to the browser.
   void NeedKey(const std::string& key_system,
                const std::string& session_id,
                pp::VarArrayBuffer init_data);
@@ skipping 19 matching lines @@
   void DeliverSamples(pp::Buffer_Dev decrypted_samples,
                       const PP_DecryptedBlockInfo& decrypted_block_info);
 
  private:
   InstanceHandle associated_instance_;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_