VideoDecodeStatsReporter: use Blink-provided foreground task runner

This is part of efforts to replace base::ThreadTaskRunnerHandle::Get()
with other appropriate task runners in the renderer.

Bug: 786332
Change-Id: I6310554d4cdbc93cd6420398ecfe9e668059dd99
Reviewed-on: https://chromium-review.googlesource.com/826605Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524305}

media/blink/video_decode_stats_reporter.cc

@@ -17,6 +17,7 @@ VideoDecodeStatsReporter::VideoDecodeStatsReporter(
     mojom::VideoDecodeStatsRecorderPtr recorder_ptr,
     GetPipelineStatsCB get_pipeline_stats_cb,
     const VideoDecoderConfig& video_config,
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
     base::TickClock* tick_clock)
     : kRecordingInterval(
           base::TimeDelta::FromMilliseconds(kRecordingIntervalMs)),
@@ -34,6 +35,7 @@ VideoDecodeStatsReporter::VideoDecodeStatsReporter(
 
   recorder_ptr_.set_connection_error_handler(base::BindRepeating(
       &VideoDecodeStatsReporter::OnIpcConnectionError, base::Unretained(this)));
+  stats_cb_timer_.SetTaskRunner(task_runner);
 }
 
 VideoDecodeStatsReporter::~VideoDecodeStatsReporter() = default;

media/blink/video_decode_stats_reporter.h

@@ -32,6 +32,7 @@ class MEDIA_BLINK_EXPORT VideoDecodeStatsReporter {
       mojom::VideoDecodeStatsRecorderPtr recorder_ptr,
       GetPipelineStatsCB get_pipeline_stats_cb,
       const VideoDecoderConfig& video_config,
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
       base::TickClock* tick_clock = base::DefaultTickClock::GetInstance());
   ~VideoDecodeStatsReporter();
 

media/blink/video_decode_stats_reporter_unittest.cc

@@ -170,7 +170,8 @@ class VideoDecodeStatsReporterTest : public ::testing::Test {
         std::move(recorder_ptr),
         base::Bind(&VideoDecodeStatsReporterTest::GetPipelineStatsCB,
                    base::Unretained(this)),
-        MakeDefaultVideoConfig(), clock_.get());
+        MakeDefaultVideoConfig(), base::ThreadTaskRunnerHandle::Get(),
+        clock_.get());
   }
 
   // Fast forward the task runner (and associated tick clock) by |milliseconds|.

media/blink/webmediaplayer_impl.cc

@@ -1524,7 +1524,8 @@ void WebMediaPlayerImpl::CreateVideoDecodeStatsReporter() {
       std::move(recorder),
       base::Bind(&WebMediaPlayerImpl::GetPipelineStatistics,
                  base::Unretained(this)),
-      pipeline_metadata_.video_decoder_config));
+      pipeline_metadata_.video_decoder_config,
+      frame_->GetTaskRunner(blink::TaskType::kUnthrottled)));
 
   if (delegate_->IsFrameHidden())
     video_decode_stats_reporter_->OnHidden();