Paint first frame faster, don't crash with no frames during EOS.

media/base/null_video_sink_unittest.cc

Index: media/base/null_video_sink_unittest.cc
diff --git a/media/base/null_video_sink_unittest.cc b/media/base/null_video_sink_unittest.cc
index aa0603be7ba6567af87801ae419e06ff5bb67b07..4fc5ed7296647343c4fef256f70d2b4b89884dcf 100644
--- a/media/base/null_video_sink_unittest.cc
+++ b/media/base/null_video_sink_unittest.cc
@@ -72,10 +72,6 @@ TEST_F(NullVideoSinkTest, BasicFunctionality) {
   std::unique_ptr<NullVideoSink> sink = ConstructSink(false, kInterval);
   scoped_refptr<VideoFrame> test_frame = CreateFrame(base::TimeDelta());
 
-  // The sink shouldn't have to be started to use the paint method.
-  EXPECT_CALL(*this, FrameReceived(test_frame));
-  sink->PaintSingleFrame(test_frame);
-
   {
     SCOPED_TRACE("Waiting for sink startup.");
     sink->Start(this);
@@ -115,6 +111,10 @@ TEST_F(NullVideoSinkTest, BasicFunctionality) {
     sink->Stop();
     event.RunAndWait();
   }
+
+  // The sink shouldn't have to be started to use the paint method.
+  EXPECT_CALL(*this, FrameReceived(test_frame));
+  sink->PaintSingleFrame(test_frame);
 }
 
 TEST_F(NullVideoSinkTest, ClocklessFunctionality) {