[CustomTabs] Report the navigation start as absolute time

base/android/java/src/org/chromium/base/TimeUtils.java

Index: base/android/java/src/org/chromium/base/TimeUtils.java
diff --git a/base/android/java/src/org/chromium/base/TimeUtils.java b/base/android/java/src/org/chromium/base/TimeUtils.java
new file mode 100644
index 0000000000000000000000000000000000000000..5d98a525e84e71298e5c18e66b1f585cfd34598b
--- /dev/null
+++ b/base/android/java/src/org/chromium/base/TimeUtils.java
@@ -0,0 +1,14 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.base;
+
+import org.chromium.base.annotations.JNINamespace;
+
+/** Time-related utilities. */
+@JNINamespace("base::android")
+public class TimeUtils {
+    /** Returns TimeTicks::Now() in microseconds. */
+    public static native long nativeGetTimeTicksNowUs();
+}