Increase ThreadTest tolerance

Aims to fix flaky test.
Decreased minimum from 90% to 80%.
Increased maximum from 110% to 120%.
Increased maximum waitMillis from 10ms to 30ms.

Bug: 18788389
Change-Id: I92477225492712448b0a78354730a037e2dda1a1

Author: Mathieu Chartier

harmony-tests/src/test/java/org/apache/harmony/tests/org/apache/harmony/kernel/dalvik/ThreadsTest.java

@@ -234,10 +234,10 @@ public void assertDurationIsInRange(long expectedMillis) {
              * Allow a bit more slop for the maximum on "expected
              * instantaneous" results.
              */
-            long minimum = (long) ((double) expectedMillis * 0.90);
+            long minimum = (long) ((double) expectedMillis * 0.80);
             long maximum =
-                Math.max((long) ((double) expectedMillis * 1.10), 10);
-            long waitMillis = Math.max(expectedMillis * 10, 10);
+                Math.max((long) ((double) expectedMillis * 1.20), 10);
+            long waitMillis = Math.max(expectedMillis * 10, 30);
             long duration = getDurationMillis(waitMillis);
 
             if (duration < minimum) {