Adjust acceptable wake-up delay in Monitor test.

runtime/vm/thread_test.cc

Index: runtime/vm/thread_test.cc
diff --git a/runtime/vm/thread_test.cc b/runtime/vm/thread_test.cc
index 3a50f75f81b34a0241ace72acfdf9af46f2ccbd5..31e794a3ae62c658b75f32ee5316df9bf4b7ab29 100644
--- a/runtime/vm/thread_test.cc
+++ b/runtime/vm/thread_test.cc
@@ -48,7 +48,7 @@ UNIT_TEST_CASE(Monitor) {
     EXPECT_EQ(Monitor::kTimedOut, wait_result);
     const int kAcceptableTimeJitter = 20;  // Measured in milliseconds.
     EXPECT_LE(wait_time - kAcceptableTimeJitter, stop - start);
-    const int kAcceptableWakeupDelay = 120;  // Measured in milliseconds.
+    const int kAcceptableWakeupDelay = 150;  // Measured in milliseconds.
     EXPECT_GE(wait_time + kAcceptableWakeupDelay, stop - start);
   }
   // The isolate shutdown and the destruction of the mutex are out-of-order on