Add support for video peek in Codec2

Video peek is a feature that enables displaying the first video frame
of a video stream decoded by a codec configured in tunnel mode.
This commit adds support for video peek to Codec2-based codecs.

Test: atest android.media.cts.DecoderTest
Merged-In: I74f0b6de2161f563a80b33f1bb3d6ff961de09b6
Merged-In: If8bc83f93d5cf12c1138c467e3152eafc3e92015
Merged-In: I298e27b1024440ea353f8a1db2afdabdb695f702

Change-Id: I533917908a7050c760374c7b607dd736ec173339
diff --git a/media/codec2/sfplugin/CCodec.cpp b/media/codec2/sfplugin/CCodec.cpp
index d942606..10a6896 100644
--- a/media/codec2/sfplugin/CCodec.cpp
+++ b/media/codec2/sfplugin/CCodec.cpp
@@ -665,6 +665,10 @@
         mCodec->mCallback->onOutputBuffersChanged();
     }
 
+    void onFirstTunnelFrameReady() override {
+        mCodec->mCallback->onFirstTunnelFrameReady();
+    }
+
 private:
     CCodec *mCodec;
 };