Add offset support to BitstreamBuffer.

content/common/gpu/client/gpu_jpeg_decode_accelerator_host.cc

 // Copyright 2015 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.
 
 #include "content/common/gpu/client/gpu_jpeg_decode_accelerator_host.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 163 matching lines @@
     // TODO(kcwu) fix the handle leak after crbug.com/493414 resolved.
 #endif
     return;
   }
 
   size_t output_buffer_size = media::VideoFrame::AllocationSize(
       video_frame->format(), video_frame->coded_size());
 
   decode_params.coded_size = video_frame->coded_size();
   decode_params.output_video_frame_handle = output_handle;
-  decode_params.output_buffer_size = output_buffer_size;
+  decode_params.output_buffer_size =
+      base::checked_cast<uint32_t>(output_buffer_size);
   Send(new AcceleratedJpegDecoderMsg_Decode(decoder_route_id_, decode_params));
 }
 
 bool GpuJpegDecodeAcceleratorHost::IsSupported() {
   return channel_->gpu_info().jpeg_decode_accelerator_supported;
 }
 
 void GpuJpegDecodeAcceleratorHost::Send(IPC::Message* message) {
   DCHECK(CalledOnValidThread());
 
   if (!channel_->Send(message)) {
     DLOG(ERROR) << "Send(" << message->type() << ") failed";
   }
 }
 
 base::WeakPtr<IPC::Listener> GpuJpegDecodeAcceleratorHost::GetReceiver() {
   return receiver_->AsWeakPtrForIO();
 }
 
 }  // namespace content