Add offset support to BitstreamBuffer.

content/common/gpu/media/vaapi_jpeg_decode_accelerator.cc

Index: content/common/gpu/media/vaapi_jpeg_decode_accelerator.cc
diff --git a/content/common/gpu/media/vaapi_jpeg_decode_accelerator.cc b/content/common/gpu/media/vaapi_jpeg_decode_accelerator.cc
index 11ff91a9d6cf18986406eb57660aaa79fdfb4514..962f431873e1c5e42694bf2846e1894c8a3157db 100644
--- a/content/common/gpu/media/vaapi_jpeg_decode_accelerator.cc
+++ b/content/common/gpu/media/vaapi_jpeg_decode_accelerator.cc
@@ -73,12 +73,11 @@ static unsigned int VaSurfaceFormatForJpeg(
 
 VaapiJpegDecodeAccelerator::DecodeRequest::DecodeRequest(
     const media::BitstreamBuffer& bitstream_buffer,
-    scoped_ptr<base::SharedMemory> shm,
+    scoped_ptr<SharedMemoryRegion> shm,
     const scoped_refptr<media::VideoFrame>& video_frame)
     : bitstream_buffer(bitstream_buffer),
       shm(shm.Pass()),
-      video_frame(video_frame) {
-}
+      video_frame(video_frame) {}
 
 VaapiJpegDecodeAccelerator::DecodeRequest::~DecodeRequest() {
 }
@@ -286,10 +285,10 @@ void VaapiJpegDecodeAccelerator::Decode(
 
   DVLOG(4) << "Mapping new input buffer id: " << bitstream_buffer.id()
            << " size: " << bitstream_buffer.size();
-  scoped_ptr<base::SharedMemory> shm(
-      new base::SharedMemory(bitstream_buffer.handle(), true));
+  scoped_ptr<SharedMemoryRegion> shm(
+      new SharedMemoryRegion(bitstream_buffer, true));
 
-  if (!shm->Map(bitstream_buffer.size())) {
+  if (!shm->Map()) {
     LOG(ERROR) << "Failed to map input buffer";
     NotifyErrorFromDecoderThread(bitstream_buffer.id(), UNREADABLE_INPUT);
     return;