Add QP for libvpx VP8 decoder.

webrtc/modules/video_coding/codecs/vp8/test/vp8_impl_unittest.cc

Index: webrtc/modules/video_coding/codecs/vp8/test/vp8_impl_unittest.cc
diff --git a/webrtc/modules/video_coding/codecs/vp8/test/vp8_impl_unittest.cc b/webrtc/modules/video_coding/codecs/vp8/test/vp8_impl_unittest.cc
index a47c209ad42945bbe4de5cd7b110aabbf3b85e1c..ea6959997b0a97472e4e7e152b07a2c5cf465803 100644
--- a/webrtc/modules/video_coding/codecs/vp8/test/vp8_impl_unittest.cc
+++ b/webrtc/modules/video_coding/codecs/vp8/test/vp8_impl_unittest.cc
@@ -92,16 +92,17 @@ class Vp8UnitTestDecodeCompleteCallback : public webrtc::DecodedImageCallback {
  public:
   explicit Vp8UnitTestDecodeCompleteCallback(rtc::Optional<VideoFrame>* frame)
       : decoded_frame_(frame), decode_complete(false) {}
-  int32_t Decoded(VideoFrame& frame) override;
+  int32_t Decoded(VideoFrame& frame) override {
+    RTC_NOTREACHED();
+    return -1;
+  }
   int32_t Decoded(VideoFrame& frame, int64_t decode_time_ms) override {
     RTC_NOTREACHED();
     return -1;
   }
   void Decoded(VideoFrame& frame,
                rtc::Optional<int32_t> decode_time_ms,
-               rtc::Optional<uint8_t> qp) override {
-    RTC_NOTREACHED();
-  }
+               rtc::Optional<uint8_t> qp) override;
   bool DecodeComplete();
 
  private:
@@ -117,10 +118,12 @@ bool Vp8UnitTestDecodeCompleteCallback::DecodeComplete() {
   return false;
 }
 
-int Vp8UnitTestDecodeCompleteCallback::Decoded(VideoFrame& image) {
-  *decoded_frame_ = rtc::Optional<VideoFrame>(image);
+void Vp8UnitTestDecodeCompleteCallback::Decoded(
+    VideoFrame& frame,
+    rtc::Optional<int32_t> decode_time_ms,
+    rtc::Optional<uint8_t> qp) {
+  *decoded_frame_ = rtc::Optional<VideoFrame>(frame);
   decode_complete = true;
-  return 0;
 }
 
 class TestVp8Impl : public ::testing::Test {