Have VDA clients inform decoder of supported picture buffer formats

media/video/video_decode_accelerator.cc

Index: media/video/video_decode_accelerator.cc
diff --git a/media/video/video_decode_accelerator.cc b/media/video/video_decode_accelerator.cc
index e35ee3ddfb64696d4176815b55a789caf1c4f298..17ffa4b74a5d69144a494201ca24ae1e1f38a8a9 100644
--- a/media/video/video_decode_accelerator.cc
+++ b/media/video/video_decode_accelerator.cc
@@ -9,9 +9,14 @@
 
 namespace media {
 
+VideoDecodeAccelerator::Config::Config() = default;
+VideoDecodeAccelerator::Config::Config(const Config& config) = default;
+
 VideoDecodeAccelerator::Config::Config(VideoCodecProfile video_codec_profile)
     : profile(video_codec_profile) {}
 
+VideoDecodeAccelerator::Config::~Config() = default;
+
 std::string VideoDecodeAccelerator::Config::AsHumanReadableString() const {
   std::ostringstream s;
   s << "profile: " << GetProfileName(profile) << " encrypted? "