Add offset support to BitstreamBuffer.

content/common/gpu/media/android_video_decode_accelerator.cc

 // Copyright (c) 2013 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/media/android_video_decode_accelerator.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 204 matching lines @@
       pending_bitstream_buffers_.front().first;
   pending_bitstream_buffers_.pop();
   TRACE_COUNTER1("media", "AVDA::PendingBitstreamBufferCount",
                  pending_bitstream_buffers_.size());
 
   if (bitstream_buffer.id() == -1) {
     media_codec_->QueueEOS(input_buf_index);
     return true;
   }
 
-  scoped_ptr<base::SharedMemory> shm(
-      new base::SharedMemory(bitstream_buffer.handle(), true));
-  RETURN_ON_FAILURE(this, shm->Map(bitstream_buffer.size()),
-                    "Failed to SharedMemory::Map()", UNREADABLE_INPUT, false);
+  scoped_ptr<SharedMemoryRegion> shm(
+      new SharedMemoryRegion(bitstream_buffer, true));
+  RETURN_ON_FAILURE(this, shm->Map(), "Failed to SharedMemoryRegion::Map()",
+                    UNREADABLE_INPUT, false);
 
   const base::TimeDelta presentation_timestamp =
       bitstream_buffer.presentation_timestamp();
   DCHECK(presentation_timestamp != media::kNoTimestamp())
       << "Bitstream buffers must have valid presentation timestamps";
 
   // There may already be a bitstream buffer with this timestamp, e.g., VP9 alt
   // ref frames, but it's OK to overwrite it because we only expect a single
   // output frame to have that timestamp. AVDA clients only use the bitstream
   // buffer id in the returned Pictures to map a bitstream buffer back to a
@@ skipping 474 matching lines @@
 
   if (UseDeferredRenderingStrategy()) {
     capabilities.flags = media::VideoDecodeAccelerator::Capabilities::
         NEEDS_ALL_PICTURE_BUFFERS_TO_DECODE;
   }
 
   return capabilities;
 }
 
 }  // namespace content