Provision to start base::SimpleTestTickClock at initial ticks

components/scheduler/child/worker_scheduler_impl_unittest.cc

 // Copyright 2015 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.
 
 #include "components/scheduler/child/worker_scheduler_impl.h"
 
 #include "base/callback.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "cc/test/ordered_simple_task_runner.h"
@@ skipping 73 matching lines @@
     WorkerSchedulerImpl::IsNotQuiescent();
   }
 
   base::SimpleTestTickClock* clock_;    // NOT OWNED
   std::vector<std::string>* timeline_;  // NOT OWNED
 };
 
 class WorkerSchedulerImplTest : public testing::Test {
  public:
   WorkerSchedulerImplTest()
-      : clock_(new base::SimpleTestTickClock()),
+      : clock_(new base::SimpleTestTickClock(
+            base::TimeTicks() + base::TimeDelta::FromMicroseconds(5000))),
         mock_task_runner_(new cc::OrderedSimpleTaskRunner(clock_.get(), true)),
         nestable_task_runner_(
             NestableTaskRunnerForTest::Create(mock_task_runner_)),
         scheduler_(new WorkerSchedulerImplForTest(nestable_task_runner_,
                                                   clock_.get())),
         timeline_(nullptr) {
-    clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
     scheduler_->GetSchedulerHelperForTesting()->SetTimeSourceForTesting(
         make_scoped_ptr(new TestTimeSource(clock_.get())));
     scheduler_->GetSchedulerHelperForTesting()
         ->GetTaskQueueManagerForTesting()
         ->SetTimeSourceForTesting(
             make_scoped_ptr(new TestTimeSource(clock_.get())));
   }
 
   ~WorkerSchedulerImplTest() override {}
 
@@ skipping 268 matching lines @@
       "run RecordTimelineTask @ 55",
       "IsNotQuiescent @ 55",  // NOTE we have to wait for quiescence.
       "CanEnterLongIdlePeriod @ 355",
       "run TimelineIdleTestTask deadline 405",
       "RunUntilIdle end @ 355"};
 
   EXPECT_THAT(timeline, ElementsAreArray(expected_timeline));
 }
 
 }  // namespace scheduler