Add offset support to BitstreamBuffer.

content/common/gpu/client/gpu_jpeg_decode_accelerator_host.cc

Index: content/common/gpu/client/gpu_jpeg_decode_accelerator_host.cc
diff --git a/content/common/gpu/client/gpu_jpeg_decode_accelerator_host.cc b/content/common/gpu/client/gpu_jpeg_decode_accelerator_host.cc
index 647010170012f2cc9e9aa0d93f8a2084ac909730..58d9172d82fc615ecfe1a325638238832f3d1ec2 100644
--- a/content/common/gpu/client/gpu_jpeg_decode_accelerator_host.cc
+++ b/content/common/gpu/client/gpu_jpeg_decode_accelerator_host.cc
@@ -176,6 +176,7 @@ void GpuJpegDecodeAcceleratorHost::Decode(
   decode_params.input_buffer_id = bitstream_buffer.id();
   decode_params.input_buffer_handle = input_handle;
   decode_params.input_buffer_size = bitstream_buffer.size();
+  decode_params.input_buffer_offset = bitstream_buffer.offset();

[Pawel Osciak, 2015/12/24 00:58:01]

We must do a base::checked_cast here and in other places like this, since
input_buffer_offset is uint32, and bitstream_buffer.offset() is off_t.

[Owen Lin, 2015/12/24 08:01:35]

Done.

   decode_params.output_video_frame_handle = output_handle;
   decode_params.output_buffer_size = output_buffer_size;
   Send(new AcceleratedJpegDecoderMsg_Decode(decoder_route_id_, decode_params));