Add sakal as an OWNER to some Android files.

I have written a large part of the code in these files and I feel I
should be an OWNER of them.

NOTRY=True

Review-Url: https://codereview.webrtc.org/2322983002
Cr-Commit-Position: refs/heads/master@{#14148}

webrtc/api/android/java/src/org/webrtc/OWNERS

@@ -1 +1,4 @@
 magjed@webrtc.org
+
+per-file Camera*=sakal@webrtc.org
+per-file Metrics.java=sakal@webrtc.org