/*
 * Copyright 2015 The Closure Compiler Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.javascript.jscomp;

/** GWT compatible no-op replacement for {@code Tracer} */
final class Tracer {
  Tracer(String type, String comment) {}

  Tracer(String comment) {}

  static void initCurrentThreadTrace() {}

  static void logCurrentThreadTrace() {}

  static void clearCurrentThreadTrace() {}

  long stop() {
    return 0L;
  }
}


@@ -654,83 +654,102 @@
 /** 
-GWT compatible no-op replacement for %7B@code Tracer%7D */%0Afinal class Tracer %7B
+Minimal Tracer replacement */%0Afinal class Tracer %7B%0A  long start = System.currentTimeMillis();%0A
 %0A  T
@@ -976,10 +976,42 @@
 urn 
-0L
+System.currentTimeMillis() + start
 ;%0A  

Enable time tracking in the performance tracker