Mojo: Increase epsilon in tests.

mojo/system/waiter_list_unittest.cc

 // Copyright 2013 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.
 
 // NOTE(vtl): These tests are inherently flaky (e.g., if run on a heavily-loaded
 // system). Sorry. |kEpsilonMicros| may be increased to increase tolerance and
 // reduce observed flakiness.
 
 #include "mojo/system/waiter_list.h"
 
 #include "base/threading/platform_thread.h"  // For |Sleep()|.
 #include "base/time/time.h"
 #include "mojo/system/waiter.h"
 #include "mojo/system/waiter_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace system {
 namespace {
 
 const int64_t kMicrosPerMs = 1000;
-const int64_t kEpsilonMicros = 15 * kMicrosPerMs;  // 15 ms.
+const int64_t kEpsilonMicros = 30 * kMicrosPerMs;  // 15 ms.
 
 TEST(WaiterListTest, BasicCancel) {
   MojoResult result;
 
   // Cancel immediately after thread start.
   {
     WaiterList waiter_list;
     test::SimpleWaiterThread thread(&result);
     waiter_list.AddWaiter(thread.waiter(), MOJO_WAIT_FLAG_READABLE, 0);
     thread.Start();
@@ skipping 224 matching lines @@
   }  // Join threads.
   EXPECT_EQ(6, result1);
   EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION, result2);
   EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION, result3);
   EXPECT_EQ(MOJO_RESULT_CANCELLED, result4);
 }
 
 }  // namespace
 }  // namespace system
 }  // namespace mojo