API access to mediametrics

provide SDK/API access to media metrics for user apps. This lets the
apps metrics data for their instances of player and codecs. Others
to come.

Bug: 34715803
Test: booted, invoked new APIs to verify desired results
Change-Id: Iaae6406aadef30adc893952961ac154a7c4c761d
diff --git a/media/jni/android_media_MediaCodec.h b/media/jni/android_media_MediaCodec.h
index 5f0d3df..b3b1b3a 100644
--- a/media/jni/android_media_MediaCodec.h
+++ b/media/jni/android_media_MediaCodec.h
@@ -111,6 +111,8 @@
 
     status_t getName(JNIEnv *env, jstring *name) const;
 
+    status_t getMetrics(JNIEnv *env, Parcel *reply) const;
+
     status_t setParameters(const sp<AMessage> &params);
 
     void setVideoScalingMode(int mode);