Reland "Move tracing calls to libbinder_ndk"

00f5a992a682e9d9ef943f165da3a9813f1501e1

Change-Id: I2151e6b2c3ddb15d9aedd493018b0252938c3639
diff --git a/libs/binder/OS_android.cpp b/libs/binder/OS_android.cpp
index 893ee15..4e9230c 100644
--- a/libs/binder/OS_android.cpp
+++ b/libs/binder/OS_android.cpp
@@ -48,6 +48,10 @@
     atrace_int(tag, name, value);
 }
 
+uint64_t get_trace_enabled_tags() {
+    return atrace_enabled_tags;
+}
+
 } // namespace os
 
 // Legacy trace symbol. To be removed once all of downstream rebuilds.