add three rs functions: uptimeMillis, startTimeMillis, elapsedTimeMillis
diff --git a/rsScriptC.cpp b/rsScriptC.cpp
index b0b8404..efe6ff7 100644
--- a/rsScriptC.cpp
+++ b/rsScriptC.cpp
@@ -20,6 +20,7 @@
 
 #include "acc/acc.h"
 #include "utils/String8.h"
+#include "utils/Timers.h"
 
 #include <GLES/gl.h>
 #include <GLES/glext.h>
@@ -62,6 +63,11 @@
         rsc->setVertex(mEnviroment.mVertex.get());
     }
 
+    if (launchIndex == 0) {
+        mEnviroment.mStartTimeMillis
+                = nanoseconds_to_milliseconds(systemTime(SYSTEM_TIME_MONOTONIC));
+    }
+
     bool ret = false;
     tls->mScript = this;
     ret = mProgram.mScript(launchIndex) != 0;