Add Mojo interfaces for GpuJpegDecodeAccelerator and GpuJpegDecodeAcceleratorHost

media/mojo/interfaces/media_types.mojom

Index: media/mojo/interfaces/media_types.mojom
diff --git a/media/mojo/interfaces/media_types.mojom b/media/mojo/interfaces/media_types.mojom
index 16612b5dcf68a8e5a7e423257f0c85cf74f80303..9dd4424e4f33fb8613f7571867e91e7ae9e90009 100644
--- a/media/mojo/interfaces/media_types.mojom
+++ b/media/mojo/interfaces/media_types.mojom
@@ -172,6 +172,18 @@ struct DecoderBuffer {
   mojo.common.mojom.TimeDelta back_discard;
 };
 
+// This defines a mojo transport format for media::BitstreamBuffer.
+struct BitstreamBuffer {

[xhwang, 2017/06/01 16:59:01]

sandersd: Will you also need this for the mojo VideoDecoder work? I wonder
whether we should just put this under media/gpu/mojo as well...

[sandersd (OOO until July 31), 2017/06/01 18:13:33]

No, MVD transports DecoderBuffers.

I am implementing GPU-side support for converting DecoderBuffers to
BitstreamBuffers, for compatibility with VDAs, but it's an ugly hack due to
BitstreamBuffer forcing us to use platform SHM.

I plan to implement an SHM virtual interface and change BitstreamBuffer to use
it, so that I can substitute the platform SHM type for a non-shared buffer.

+  int32 id;
+  handle<shared_buffer> memory_handle;
+  uint32 size;
+  uint64 offset;
+  mojo.common.mojom.TimeDelta timestamp;
+  string key_id;
+  string iv;
+  array<SubsampleEntry> subsamples;
+};
+
 // This defines a mojo transport format for media::AudioBuffer.
 struct AudioBuffer {
   // Format of the audio.