Log requested sharing mode.

As the requested sharing mode may not be the same as what is requested,
it will good to log the requested sharing mode.

Bug: 185912462
Test: atest MediaMetricsAtomTests
Test: dumpsys media.metrics

Change-Id: I963d24c5f3e5e0d6cba7764892b010b78b0cd8ad
diff --git a/media/libmediametrics/include/MediaMetricsConstants.h b/media/libmediametrics/include/MediaMetricsConstants.h
index 66108df..a09a673 100644
--- a/media/libmediametrics/include/MediaMetricsConstants.h
+++ b/media/libmediametrics/include/MediaMetricsConstants.h
@@ -166,6 +166,8 @@
 // "powerSaving"
 #define AMEDIAMETRICS_PROP_PERFORMANCEMODEACTUAL "performanceModeActual" // string
 #define AMEDIAMETRICS_PROP_FRAMESTRANSFERRED "framesTransferred" // int64_t, transferred frames
+// string value, "exclusive", "shared". the actual selected sharing mode by the server
+#define AMEDIAMETRICS_PROP_SHARINGMODEACTUAL "sharingModeActual"
 
 // Timing values: millisecond values are suffixed with MS and the type is double
 // nanosecond values are suffixed with NS and the type is int64.