SF: Omit layer tree dump if flag is specified

Bug: None
Test: dumpsys SurfaceFlinger --vsync
Change-Id: I4214d75faff5c0ee1f29ff3d63b45e5e0825dba7
diff --git a/services/surfaceflinger/TimeStats/TimeStats.cpp b/services/surfaceflinger/TimeStats/TimeStats.cpp
index c97a19b..1ac5098 100644
--- a/services/surfaceflinger/TimeStats/TimeStats.cpp
+++ b/services/surfaceflinger/TimeStats/TimeStats.cpp
@@ -613,7 +613,7 @@
     if (asProto) {
         ALOGD("Dumping TimeStats as proto");
         SFTimeStatsGlobalProto timeStatsProto = mTimeStats.toProto(maxLayers);
-        result.append(timeStatsProto.SerializeAsString().c_str(), timeStatsProto.ByteSize());
+        result.append(timeStatsProto.SerializeAsString());
     } else {
         ALOGD("Dumping TimeStats as text");
         result.append(mTimeStats.toString(maxLayers));