Add mediametrics enum for MediaExtractor usage

Bug: 170386720
Test: Manually built the tree.
Change-Id: I953dd1891ef71dd9d5afbf8e154fdf0a3095d913
(cherry picked from commit bfe14daff8)
Merged-In: I953dd1891ef71dd9d5afbf8e154fdf0a3095d913
Merged-In: Id10861db464b88734c34c81db945b1a828f0bc2c

core/proto/android/stats/mediametrics/mediametrics.proto

@@ -166,12 +166,23 @@ message CodecData {
  * Logged from:
  *   frameworks/av/media/libstagefright/RemoteMediaExtractor.cpp
  *   frameworks/av/services/mediaanalytics/statsd_extractor.cpp
- * Next Tag: 4
+ * Next Tag: 5
  */
 message ExtractorData {
     optional string format = 1;
     optional string mime = 2;
     optional int32 tracks = 3;
+
+    enum EntryPoint {
+        UNSET = 0; // For backwards compatibility with clients that don't
+                   // collect the entry point.
+        SDK = 1;
+        NDK_WITH_JVM = 2;
+        NDK_NO_JVM = 3;
+        OTHER = 4; // For extractor users that don't make use of the APIs.
+    }
+
+    optional EntryPoint entry_point = 4 [default = UNSET];
 }
 
 /**