V4L2SVDA: Add a VP9Accelerator implementation utilizing the V4L2 VP9 frame API.

media/gpu/vaapi_video_decode_accelerator.cc

Index: media/gpu/vaapi_video_decode_accelerator.cc
diff --git a/media/gpu/vaapi_video_decode_accelerator.cc b/media/gpu/vaapi_video_decode_accelerator.cc
index 5d4d866f85bf2367af8a8684b3e87c3b0ffda465..7e40db6119651efffe4baf04418fe42812220d2f 100644
--- a/media/gpu/vaapi_video_decode_accelerator.cc
+++ b/media/gpu/vaapi_video_decode_accelerator.cc
@@ -249,10 +249,16 @@ class VaapiVideoDecodeAccelerator::VaapiVP9Accelerator
       const scoped_refptr<VP9Picture>& pic,
       const Vp9SegmentationParams& seg,
       const Vp9LoopFilterParams& lf,
-      const std::vector<scoped_refptr<VP9Picture>>& ref_pictures) override;
+      const std::vector<scoped_refptr<VP9Picture>>& ref_pictures,
+      const base::Closure& done_cb) override;
 
   bool OutputPicture(const scoped_refptr<VP9Picture>& pic) override;
 
+  bool RequiresFrameContext() const override { return false; }
+
+  bool GetFrameContext(const scoped_refptr<VP9Picture>& pic,
+                       Vp9FrameContext* frame_ctx) override;
+
  private:
   scoped_refptr<VaapiDecodeSurface> VP9PictureToVaapiDecodeSurface(
       const scoped_refptr<VP9Picture>& pic);
@@ -619,6 +625,11 @@ void VaapiVideoDecodeAccelerator::DecodeTask() {
 
         break;
 
+      case AcceleratedVideoDecoder::kNeedContextUpdate:
+        // This should not happen as we return false from RequiresFrameContext.
+        NOTREACHED() << "Context updates not supported";
+        return;
+
       case AcceleratedVideoDecoder::kDecodeError:
         RETURN_AND_NOTIFY_ON_FAILURE(false, "Error decoding stream",
                                      PLATFORM_FAILURE, );
@@ -1719,7 +1730,14 @@ bool VaapiVideoDecodeAccelerator::VaapiVP9Accelerator::SubmitDecode(
     const scoped_refptr<VP9Picture>& pic,
     const Vp9SegmentationParams& seg,
     const Vp9LoopFilterParams& lf,
-    const std::vector<scoped_refptr<VP9Picture>>& ref_pictures) {
+    const std::vector<scoped_refptr<VP9Picture>>& ref_pictures,
+    const base::Closure& done_cb) {
+  // TODO(posciak): We don't currently have the ability to know when the surface
+  // is decoded, as we submit both the decode job and output independently and
+  // don't wait for just the decode to be finished, instead relying on the
+  // driver to execute them in correct order.
+  DCHECK(!done_cb.is_null());
+
   VADecPictureParameterBufferVP9 pic_param;
   memset(&pic_param, 0, sizeof(pic_param));
 
@@ -1848,6 +1866,13 @@ bool VaapiVideoDecodeAccelerator::VaapiVP9Accelerator::OutputPicture(
   return true;
 }
 
+bool VaapiVideoDecodeAccelerator::VaapiVP9Accelerator::GetFrameContext(
+    const scoped_refptr<VP9Picture>& pic,
+    Vp9FrameContext* frame_ctx) {
+  NOTIMPLEMENTED() << "Frame context update not supported";
+  return false;
+}
+
 scoped_refptr<VaapiVideoDecodeAccelerator::VaapiDecodeSurface>
 VaapiVideoDecodeAccelerator::VaapiVP9Accelerator::
     VP9PictureToVaapiDecodeSurface(const scoped_refptr<VP9Picture>& pic) {