Bug 1529738 - Add profiler markers for video frames dropped due to slow video decode. r=jya,mstange

Differential Revision: https://phabricator.services.mozilla.com/D20760

--HG--
extra : moz-landing-system : lando

dom/media/MediaFormatReader.cpp

@@ -7,6 +7,7 @@
 #include "MediaFormatReader.h"
 
 #include "AllocationPolicy.h"
+#include "GeckoProfiler.h"
 #include "MediaData.h"
 #include "MediaInfo.h"
 #include "VideoFrameContainer.h"
@@ -2631,6 +2632,7 @@ void MediaFormatReader::SkipVideoDemuxToNextKeyFrame(TimeUnit aTimeThreshold) {
 }
 
 void MediaFormatReader::VideoSkipReset(uint32_t aSkipped) {
+  PROFILER_ADD_MARKER("SkippedVideoDecode", GRAPHICS);
   MOZ_ASSERT(OnTaskQueue());
 
   // Some frames may have been output by the decoder since we initiated the

dom/media/mediasink/VideoSink.cpp

@@ -10,8 +10,10 @@
 #  include "mmsystem.h"
 #endif
 
-#include "MediaQueue.h"
 #include "VideoSink.h"
+
+#include "GeckoProfiler.h"
+#include "MediaQueue.h"
 #include "VideoUtils.h"
 
 #include "mozilla/IntegerPrintfMacros.h"
@@ -451,6 +453,10 @@ void VideoSink::UpdateRenderedVideoFrames() {
     }
   }
 
+  if (droppedCount > 0) {
+    PROFILER_ADD_MARKER("DroppedUncompositedVideoFrames", GRAPHICS);
+  }
+
   if (droppedCount || sentToCompositorCount) {
     uint32_t totalCompositorDroppedCount = mContainer->GetDroppedImageCount();
     uint32_t compositorDroppedCount =