Add offset support to BitstreamBuffer.

content/common/gpu/client/gpu_video_decode_accelerator_host.cc

 // 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.
 
 #include "content/common/gpu/client/gpu_video_decode_accelerator_host.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "build/build_config.h"
@@ skipping 112 matching lines @@
   base::SharedMemoryHandle handle = channel_->ShareToGpuProcess(
       bitstream_buffer.handle());
   if (!base::SharedMemory::IsHandleValid(handle)) {
     NOTREACHED() << "Failed to duplicate buffer handler";
     return;
   }
 
   AcceleratedVideoDecoderMsg_Decode_Params params;
   params.bitstream_buffer_id = bitstream_buffer.id();
   params.buffer_handle = handle;
-  params.size = bitstream_buffer.size();
+  params.size = base::checked_cast<uint32_t>(bitstream_buffer.size());
+  params.offset = base::checked_cast<uint32_t>(bitstream_buffer.offset());
   params.presentation_timestamp = bitstream_buffer.presentation_timestamp();
   params.key_id = bitstream_buffer.key_id();
   params.iv = bitstream_buffer.iv();
   params.subsamples = bitstream_buffer.subsamples();
 
   Send(new AcceleratedVideoDecoderMsg_Decode(decoder_route_id_, params));
 }
 
 void GpuVideoDecodeAcceleratorHost::AssignPictureBuffers(
     const std::vector<media::PictureBuffer>& buffers) {
@@ skipping 139 matching lines @@
   weak_this_factory_.InvalidateWeakPtrs();
 
   // Client::NotifyError() may Destroy() |this|, so calling it needs to be the
   // last thing done on this stack!
   media::VideoDecodeAccelerator::Client* client = NULL;
   std::swap(client, client_);
   client->NotifyError(static_cast<media::VideoDecodeAccelerator::Error>(error));
 }
 
 }  // namespace content