Add unit tests for qp parser.

webrtc/modules/video_coding/codecs/test/videoprocessor_integrationtest.h

Index: webrtc/modules/video_coding/codecs/test/videoprocessor_integrationtest.h
diff --git a/webrtc/modules/video_coding/codecs/test/videoprocessor_integrationtest.h b/webrtc/modules/video_coding/codecs/test/videoprocessor_integrationtest.h
index 2481252c7b275e16f2a53ad588c867ab615defde..8ca2d3ca06ef31a04e757a2054124fd9c02a4a99 100644
--- a/webrtc/modules/video_coding/codecs/test/videoprocessor_integrationtest.h
+++ b/webrtc/modules/video_coding/codecs/test/videoprocessor_integrationtest.h
@@ -494,6 +494,14 @@ class VideoProcessorIntegrationTest : public testing::Test {
     EXPECT_GT(ssim_result.min, quality_thresholds.min_min_ssim);
   }
 
+  void VerifyQpParser(const CodecParams& process, int frame_number) {
+    if (!process.hw_codec && (process.codec_type == kVideoCodecVP8 ||
+      process.codec_type == kVideoCodecVP9)) {
+      EXPECT_EQ(processor_->GetQpFromEncoder(frame_number),
+                processor_->GetQpFromBitstream(frame_number));
+    }
+  }
+
   // Temporal layer index corresponding to frame number, for up to 3 layers.
   int TemporalLayerIndexForFrame(int frame_number) {
     int tl_idx = -1;
@@ -605,7 +613,7 @@ class VideoProcessorIntegrationTest : public testing::Test {
 
       while (frame_number < num_frames) {
         EXPECT_TRUE(processor_->ProcessFrame(frame_number));
-
+        VerifyQpParser(process, frame_number);
         ++num_frames_per_update_[TemporalLayerIndexForFrame(frame_number)];
         ++num_frames_total_;
         UpdateRateControlMetrics(frame_number);