Bug 568863 follow-up: add reset() to the JavaScript API. r=waldo a2.0=sayrer

js/src/perf/jsperf.cpp

@@ -126,6 +126,17 @@ pm_stop(JSContext* cx, uintN /*unused*/, jsval* vp)
     return JS_TRUE;
 }
 
+static JSBool
+pm_reset(JSContext* cx, uintN /*unused*/, jsval* vp)
+{
+    PerfMeasurement* p = GetPMFromThis(cx, vp);
+    if (!p)
+        return JS_FALSE;
+
+    p->reset();
+    return JS_TRUE;
+}
+
 static JSBool
 pm_canMeasureSomething(JSContext* cx, uintN /*unused*/, jsval* vp)
 {
@@ -141,6 +152,7 @@ const uint8 PM_FATTRS = JSPROP_READONLY | JSPROP_PERMANENT | JSPROP_SHARED;
 static JSFunctionSpec pm_fns[] = {
     JS_FN("start",               pm_start,               0, PM_FATTRS),
     JS_FN("stop",                pm_stop,                0, PM_FATTRS),
+    JS_FN("reset",               pm_reset,               0, PM_FATTRS),
     JS_FN("canMeasureSomething", pm_canMeasureSomething, 0, PM_FATTRS),
     JS_FS_END
 };