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..aad15046170d59430b2e8a0c242eba2f61fad6d0 100644
--- a/content/common/gpu/client/gpu_jpeg_decode_accelerator_host.cc
+++ b/content/common/gpu/client/gpu_jpeg_decode_accelerator_host.cc
@@ -175,9 +175,13 @@ 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>(bitstream_buffer.size());
+  decode_params.input_buffer_offset =
+      base::checked_cast<uint32>(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>(output_buffer_size);
   Send(new AcceleratedJpegDecoderMsg_Decode(decoder_route_id_, decode_params));
 }