GpuVideoDecodeAccelerator/Host runs IPCs between renderer and GPU
processes, sharing a route with a specific CommandBufferStub/ProxyImpl.
This is a bit tricky to do with Mojo because Media IPCs are a layer
above GPU, and we therefore need CommandBuffer-associated interfaces
that CommandBuffer doesn't know about.
To facilitate this we introduce a generic BindMediaReceiver API on
CommandBuffer which takes a mojo::GenericPendingAssociatedReceiver, i.e.
an associated interface endpoint that can be of any type. We then
introduce a GPU-side hook that the Media stack can use to handle such
requests.
The primordial associated interface introduced here is
GpuAcceleratedVideoDecoderProvider, which in turn has a single IPC for
binding a GpuAcceleratedVideoDecoder/Client pair, also associated with
the CommandBuffer.
This migration removes the last remaining legacy IPC messages used by
the GPU process, so once this is landed we can altogether remove IPC
Channel from GPU code.
Bug: 1196476, 993189
Change-Id: Ife986434b3c10b5796ce995d837a37c29514af49
Test: manually tested with custom extension doing a hardware VP9 decode via pp::VideoDecoder
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2956897
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Sean Topping <seantopping@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#893111}
a55ea67117