VibratorService: Fix to ensure actual delay in a vibrate pattern

delay might timeout early as value of duration isn't updated
correctly in the loop, should the wait be interrupted, to reflect
the elapsed time. Fix is to update duration in the loop.

Change-Id: I525b0e97799b288f46ae3a056cff7dcc69701bb0

Author: Ethan1983

services/java/com/android/server/VibratorService.java

@@ -441,7 +441,7 @@ private class VibrateThread extends Thread {
 
         private void delay(long duration) {
             if (duration > 0) {
-                long bedtime = SystemClock.uptimeMillis();
+                long bedtime = duration + SystemClock.uptimeMillis();
                 do {
                     try {
                         this.wait(duration);
@@ -451,8 +451,7 @@ private void delay(long duration) {
                     if (mDone) {
                         break;
                     }
-                    duration = duration
-                            - SystemClock.uptimeMillis() - bedtime;
+                    duration = bedtime - SystemClock.uptimeMillis();
                 } while (duration > 0);
             }
         }