diff --git a/src/com/android/contacts/common/util/StopWatch.java b/src/com/android/contacts/common/util/StopWatch.java
new file mode 100644
index 0000000..581d6ee
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+++ b/src/com/android/contacts/common/util/StopWatch.java
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * 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.android.contacts.common.util;
+
+import android.util.Log;
+
+import com.google.common.collect.Lists;
+
+import java.util.ArrayList;
+
+/**
+ * A {@link StopWatch} records start, laps and stop, and print them to logcat.
+ */
+public class StopWatch {
+
+    private final String mLabel;
+
+    private final ArrayList<Long> mTimes = Lists.newArrayList();
+    private final ArrayList<String> mLapLabels = Lists.newArrayList();
+
+    private StopWatch(String label) {
+        mLabel = label;
+        lap("");
+    }
+
+    /**
+     * Create a new instance and start it.
+     */
+    public static StopWatch start(String label) {
+        return new StopWatch(label);
+    }
+
+    /**
+     * Record a lap.
+     */
+    public void lap(String lapLabel) {
+        mTimes.add(System.currentTimeMillis());
+        mLapLabels.add(lapLabel);
+    }
+
+    /**
+     * Stop it and log the result, if the total time >= {@code timeThresholdToLog}.
+     */
+    public void stopAndLog(String TAG, int timeThresholdToLog) {
+
+        lap("");
+
+        final long start = mTimes.get(0);
+        final long stop = mTimes.get(mTimes.size() - 1);
+
+        final long total = stop - start;
+        if (total < timeThresholdToLog) return;
+
+        final StringBuilder sb = new StringBuilder();
+        sb.append(mLabel);
+        sb.append(",");
+        sb.append(total);
+        sb.append(": ");
+
+        long last = start;
+        for (int i = 1; i < mTimes.size(); i++) {
+            final long current = mTimes.get(i);
+            sb.append(mLapLabels.get(i));
+            sb.append(",");
+            sb.append((current - last));
+            sb.append(" ");
+            last = current;
+        }
+        Log.v(TAG, sb.toString());
+    }
+
+    /**
+     * Return a dummy instance that does no operations.
+     */
+    public static StopWatch getNullStopWatch() {
+        return NullStopWatch.INSTANCE;
+    }
+
+    private static class NullStopWatch extends StopWatch {
+        public static final NullStopWatch INSTANCE = new NullStopWatch();
+
+        public NullStopWatch() {
+            super(null);
+        }
+
+        @Override
+        public void lap(String lapLabel) {
+            // noop
+        }
+
+        @Override
+        public void stopAndLog(String TAG, int timeThresholdToLog) {
+            // noop
+        }
+    }
+}