ppapi_proxy: Support loading and reading urls. Proxy URLLoader....

src/shared/ppapi_proxy/browser_callback.h

 // Copyright (c) 2010 The Native Client 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 NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_BROWSER_CALLBACK_H_
 #define NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_BROWSER_CALLBACK_H_
 
 #include "native_client/src/include/portability.h"
 
 struct NaClSrpcChannel;
 struct PP_CompletionCallback;
 
 namespace ppapi_proxy {
 
 // Returns a PP_CompletionCallback that will call the remote implementation of
 // a callback by |callback_id| on the plugin side on |srpc_channel|.
 // Allocates data that will be deleted by the underlying callback function.
 // Returns NULL callback on failure.
 struct PP_CompletionCallback MakeRemoteCompletionCallback(
     NaClSrpcChannel* srpc_channel,
     int32_t callback_id);
+struct PP_CompletionCallback MakeRemoteCompletionCallback(
+    NaClSrpcChannel* srpc_channel,
+    int32_t callback_id,
+     // For callbacks invoked on a byte read.
+    int32_t bytes_to_read,
+    char** buffer);
 
 // If the callback won't be called, use this to clean up the data from
 // the function above.
 void DeleteRemoteCallbackInfo(struct PP_CompletionCallback callback);
 
 }  // namespace ppapi_proxy
 
 #endif  // NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_BROWSER_CALLBACK_H_