media: VideoFrame: add offset for shared memory buffers

content/common/gpu/client/gpu_video_encode_accelerator_host.cc

 // Copyright 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/client/gpu_video_encode_accelerator_host.h"
 
 #include "base/logging.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "content/common/gpu/client/gpu_channel_host.h"
 #include "content/common/gpu/gpu_messages.h"
@@ skipping 166 matching lines @@
   size_t frame_size = 0;
   for (size_t i = 0; i < plane_count; ++i) {
     // Cast DCHECK parameters to void* to avoid printing uint8* as a string.
     DCHECK_EQ(reinterpret_cast<void*>(frame->data(i)),
               reinterpret_cast<void*>((frame->data(0) + frame_size)))
         << "plane=" << i;
     frame_size += frame->stride(i) * frame->rows(i);
   }
 
   Send(new AcceleratedVideoEncoderMsg_Encode(
-      encoder_route_id_, next_frame_id_, handle, frame_size, force_keyframe));
+      encoder_route_id_, next_frame_id_, handle, frame->shared_memory_offset(),

[DaleCurtis, 2015/01/30 18:44:59]

Who is setting this value? It looks like it's always zero.

[llandwerlin-old, 2015/01/31 22:42:53]

For now, it's always zero.
The idea is to get this new attribute in for PPB_VideoEncoder : 
https://codereview.chromium.org/859313002/diff/1/content/renderer/pepper/pepp...

+      frame_size, force_keyframe));
   frame_map_[next_frame_id_] = frame;
 
   // Mask against 30 bits, to avoid (undefined) wraparound on signed integer.
   next_frame_id_ = (next_frame_id_ + 1) & 0x3FFFFFFF;
 }
 
 void GpuVideoEncodeAcceleratorHost::UseOutputBitstreamBuffer(
     const media::BitstreamBuffer& buffer) {
   DCHECK(CalledOnValidThread());
   if (!channel_)
@@ skipping 113 matching lines @@
   weak_this_factory_.InvalidateWeakPtrs();
 
   // Client::NotifyError() may Destroy() |this|, so calling it needs to be the
   // last thing done on this stack!
   media::VideoEncodeAccelerator::Client* client = NULL;
   std::swap(client_, client);
   client->NotifyError(error);
 }
 
 }  // namespace content