Transfer media::VideoFrame using mojo shared memory

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 085256eac3a139d30c26905ba51c1d4dd508dd21..d04f434eb537f012912427fd3b1ae934354c9fa0 100644
--- a/media/mojo/interfaces/media_types.mojom
+++ b/media/mojo/interfaces/media_types.mojom
@@ -266,8 +266,6 @@ struct AudioBuffer {
 };
 
 // This defines a mojo transport format for media::VideoFrame.
-// TODO(jrummell): Support shared memory based VideoFrame to avoid copying
-// the data multiple times.
 struct VideoFrame {
   // Format of the frame.
   VideoFormat format;
@@ -287,8 +285,16 @@ struct VideoFrame {
   // Timestamp in microseconds of the associated frame.
   int64 timestamp_usec;
 
-  // Frame data for each plane. Will be null for EOS buffers.
-  array<uint8>? y_data;
-  array<uint8>? u_data;
-  array<uint8>? v_data;
+  // Reference to the shared memory containing the frame's data.
+  handle<shared_buffer> frame_data;
+  uint64 frame_data_size;
+
+  // Stride and offsets for each plane. Offsets are relative to the start
+  // of |frame_data|.
+  int32 y_stride;
+  int32 u_stride;
+  int32 v_stride;
+  int32 y_offset;
+  int32 u_offset;
+  int32 v_offset;
 };