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 eac971b43b7eb51a3291ca5962b8379e7d754e24..caa82e8332b0bccff0e53322dcf56a4fec9be3ab 100644
--- a/content/common/gpu/client/gpu_jpeg_decode_accelerator_host.cc
+++ b/content/common/gpu/client/gpu_jpeg_decode_accelerator_host.cc
@@ -179,9 +179,13 @@ void GpuJpegDecodeAcceleratorHost::Decode(
   decode_params.coded_size = video_frame->coded_size();
   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_size =
+      base::checked_cast<uint32_t>(bitstream_buffer.size());
+  decode_params.input_buffer_offset =
+      base::checked_cast<uint32_t>(bitstream_buffer.offset());
   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));
 }