Make painting a single frame a permanent API on VideoRendererSink.

media/test/pipeline_integration_test_base.cc

Index: media/test/pipeline_integration_test_base.cc
diff --git a/media/test/pipeline_integration_test_base.cc b/media/test/pipeline_integration_test_base.cc
index a87f1810baac2e25e54cf74333dd3d81ba1ad08e..38421836760246804bb5119158a2244a1c4d3cac 100644
--- a/media/test/pipeline_integration_test_base.cc
+++ b/media/test/pipeline_integration_test_base.cc
@@ -354,8 +354,9 @@ void PipelineIntegrationTestBase::OnVideoFramePaint(
   int result;
   if (frame->metadata()->GetInteger(VideoFrameMetadata::COLOR_SPACE, &result))
     last_video_frame_color_space_ = static_cast<ColorSpace>(result);
-  if (!hashing_enabled_)
+  if (!hashing_enabled_ || last_frame_ == frame)
     return;
+  last_frame_ = frame;
   VideoFrame::HashFrameForTesting(&md5_context_, frame);
 }