Implement video peek for Codec2 based codecs

Bug: 184030186
Test: atest android.media.cts.DecoderTest
Change-Id: I74f0b6de2161f563a80b33f1bb3d6ff961de09b6
diff --git a/media/codec2/sfplugin/CCodec.cpp b/media/codec2/sfplugin/CCodec.cpp
index ce15a30..16398a4 100644
--- a/media/codec2/sfplugin/CCodec.cpp
+++ b/media/codec2/sfplugin/CCodec.cpp
@@ -673,6 +673,10 @@
         mCodec->mCallback->onOutputBuffersChanged();
     }
 
+    void onFirstTunnelFrameReady() override {
+        mCodec->mCallback->onFirstTunnelFrameReady();
+    }
+
 private:
     CCodec *mCodec;
 };