transcoder: add hevc->avc unit test and verify formats.

bug: 154734285
bug: 152091443
tests: unit testing.
Change-Id: If755df8e05e5e211b69869c7e0d8299138ff230c
diff --git a/media/libmediatranscoding/transcoder/Android.bp b/media/libmediatranscoding/transcoder/Android.bp
index 843d047..59cd96d 100644
--- a/media/libmediatranscoding/transcoder/Android.bp
+++ b/media/libmediatranscoding/transcoder/Android.bp
@@ -23,6 +23,7 @@
         "MediaSampleWriter.cpp",
         "MediaTrackTranscoder.cpp",
         "MediaTranscoder.cpp",
+        "NdkCommon.cpp",
         "PassthroughTrackTranscoder.cpp",
         "VideoTrackTranscoder.cpp",
     ],