Add DecodedImageCallback::Decoded() function with custom decode time value.

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

Index: webrtc/modules/video_coding/codecs/test/videoprocessor.h
diff --git a/webrtc/modules/video_coding/codecs/test/videoprocessor.h b/webrtc/modules/video_coding/codecs/test/videoprocessor.h
index 0b094ae73ec65626211534959b2b9a2966ee340a..6abe6bd72b14bd8defead936250976a6faaaa2fc 100644
--- a/webrtc/modules/video_coding/codecs/test/videoprocessor.h
+++ b/webrtc/modules/video_coding/codecs/test/videoprocessor.h
@@ -248,6 +248,10 @@ class VideoProcessorImpl : public VideoProcessor {
       : video_processor_(vp) {
     }
       int32_t Decoded(webrtc::VideoFrame& image) override;
+      int32_t Decoded(
+          webrtc::VideoFrame& image, int64_t decode_time_ms) override {
+        return Decoded(image);
+      }
 
    private:
     VideoProcessorImpl* video_processor_;