Use the right clock in UrlBarAutoShowManager

 Bug: 5291191

Change-Id: Ie4a11be79d24af9075e40a0f20cddd39e515ae17
diff --git a/src/com/android/browser/UrlBarAutoShowManager.java b/src/com/android/browser/UrlBarAutoShowManager.java
index b491e0b..f1bbe7f 100644
--- a/src/com/android/browser/UrlBarAutoShowManager.java
+++ b/src/com/android/browser/UrlBarAutoShowManager.java
@@ -103,7 +103,7 @@
         case MotionEvent.ACTION_DOWN:
             if (!mIsTracking && event.getPointerCount() == 1) {
                 long sinceLastScroll =
-                        System.currentTimeMillis() - mLastScrollTime;
+                        SystemClock.uptimeMillis() - mLastScrollTime;
                 if (sinceLastScroll < IGNORE_INTERVAL) {
                     break;
                 }