Allow to use {FFmpeg/Vpx}VideoDecoder from a UtilityProcess

media/filters/vpx_video_decoder.cc

Index: media/filters/vpx_video_decoder.cc
diff --git a/media/filters/vpx_video_decoder.cc b/media/filters/vpx_video_decoder.cc
index 9f8d786ce2d99b00faab09c8d6cec4aa334e002b..22bab44e3a28c0d5f76bf11b55510fe4cee42584 100644
--- a/media/filters/vpx_video_decoder.cc
+++ b/media/filters/vpx_video_decoder.cc
@@ -35,6 +35,7 @@
 #include "media/base/bind_to_current_loop.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/media_switches.h"
+#include "media/base/video_frame_provider.h"
 
 // Include libvpx header files.
 // VPX_CODEC_DISABLE_COMPAT excludes parts of the libvpx API that provide
@@ -341,6 +342,15 @@ VpxVideoDecoder::VpxVideoDecoder()
   thread_checker_.DetachFromThread();
 }
 
+VpxVideoDecoder::VpxVideoDecoder(
+    std::unique_ptr<VideoFrameProvider> video_frame_provider)
+    : state_(kUninitialized),
+      vpx_codec_(nullptr),
+      vpx_codec_alpha_(nullptr),
+      frame_pool_(std::move(video_frame_provider)) {
+  thread_checker_.DetachFromThread();
+}
+
 VpxVideoDecoder::~VpxVideoDecoder() {
   DCHECK(thread_checker_.CalledOnValidThread());
   CloseDecoder();