Provide a safer URLLoader ReadResponseBody API

ppapi/thunk/ppb_url_loader_api.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_THUNK_URL_LOADER_API_H_
 #define PPAPI_THUNK_URL_LOADER_API_H_
 
 #include "base/memory/ref_counted.h"
 #include "ppapi/c/ppb_url_loader.h"
 #include "ppapi/c/trusted/ppb_url_loader_trusted.h"
@@ skipping 23 matching lines @@
 
   virtual int32_t FollowRedirect(scoped_refptr<TrackedCallback> callback) = 0;
   virtual PP_Bool GetUploadProgress(int64_t* bytes_sent,
                                     int64_t* total_bytes_to_be_sent) = 0;
   virtual PP_Bool GetDownloadProgress(int64_t* bytes_received,
                                       int64_t* total_bytes_to_be_received) = 0;
   virtual PP_Resource GetResponseInfo() = 0;
   virtual int32_t ReadResponseBody(void* buffer,
                                    int32_t bytes_to_read,
                                    scoped_refptr<TrackedCallback> callback) = 0;
+  virtual int32_t ReadResponseBodyToArray(
+      int32_t max_read_length,
+      PP_ArrayOutput* buffer,
+      scoped_refptr<TrackedCallback> callback) = 0;
   virtual int32_t FinishStreamingToFile(
       scoped_refptr<TrackedCallback> callback) = 0;
   virtual void Close() = 0;
 
   // Trusted API.
   virtual void GrantUniversalAccess() = 0;
   virtual void SetStatusCallback(PP_URLLoaderTrusted_StatusCallback cb) = 0;
 
   // Internal function. This will fill in the given response info data and
   // return true on sucesss. If the dowbload was to a file, there will be one
   // plugin reference transferred to the caller. On failure, returns false.
   //
   // If body_as_file_ref is non-zero, this will transfer one plugin reference
   // to that object to the caller.
   virtual bool GetResponseInfoData(URLResponseInfoData* data) = 0;
 };
 
 }  // namespace thunk
 }  // namespace ppapi
 
 #endif  // PPAPI_THUNK_URL_LOADER_API_H_