Add mailbox-based Mojo VideoFrame variant.

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 0bd3b3a1ae43c70e9edd38a65828f0b5fbff79c8..35a6860e78b2da394c76d95c45b9ad1c5f2804b2 100644
--- a/media/mojo/interfaces/media_types.mojom
+++ b/media/mojo/interfaces/media_types.mojom
@@ -4,8 +4,9 @@
 
 module media.mojom;
 
-import "ui/gfx/geometry/mojo/geometry.mojom";
+import "gpu/ipc/common/mailbox_holder.mojom";
 import "mojo/common/time.mojom";
+import "ui/gfx/geometry/mojo/geometry.mojom";
 
 // See media/base/buffering_state.h for descriptions.
 [Native]
@@ -177,6 +178,18 @@ struct VideoFrame {
   // Timestamp in microseconds of the associated frame.
   mojo.common.mojom.TimeDelta timestamp;
 
+  // Contents of the video frame.
+  VideoFrameData data;
+};
+
+// Possible choices for storing VideoFrame data.
+union VideoFrameData {
+  SharedBufferVideoFrameData shared_buffer_data;
+  MailboxVideoFrameData mailbox_data;
+};
+
+// This defines video frame data stored in a Mojo shared buffer.
+struct SharedBufferVideoFrameData {
   // Reference to the shared memory containing the frame's data.
   handle<shared_buffer> frame_data;
   uint64 frame_data_size;
@@ -191,6 +204,11 @@ struct VideoFrame {
   uint64 v_offset;
 };
 
+// This defines video frame data stored in texture mailboxes.
+struct MailboxVideoFrameData {
+  array<gpu.mojom.MailboxHolder> mailbox_holder;
+};
+
 struct PipelineStatistics {
   uint64 audio_bytes_decoded;
   uint64 video_bytes_decoded;