Provision to start base::SimpleTestTickClock at initial ticks

components/scheduler/child/scheduler_helper_unittest.cc

 // Copyright 2014 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/scheduler_helper.h"
 
 #include "base/callback.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "cc/test/ordered_simple_task_runner.h"
 #include "components/scheduler/child/nestable_task_runner_for_test.h"
@@ skipping 26 matching lines @@
         base::Bind(AppendToVectorReentrantTask, base::Unretained(task_runner),
                    vector, reentrant_count, max_reentrant_count));
   }
 }
 
 };  // namespace
 
 class SchedulerHelperTest : public testing::Test {
  public:
   SchedulerHelperTest()
-      : clock_(new base::SimpleTestTickClock()),
+      : clock_(new base::SimpleTestTickClock(
+            base::TimeTicks() + base::TimeDelta::FromMicroseconds(1))),
         mock_task_runner_(new cc::OrderedSimpleTaskRunner(clock_.get(), false)),
         nestable_task_runner_(
             NestableTaskRunnerForTest::Create(mock_task_runner_)),
         scheduler_helper_(
             new SchedulerHelper(nestable_task_runner_,
                                 "test.scheduler",
                                 TRACE_DISABLED_BY_DEFAULT("test.scheduler"),
                                 TRACE_DISABLED_BY_DEFAULT("test.scheduler.dbg"),
                                 SchedulerHelper::TASK_QUEUE_COUNT)),
         default_task_runner_(scheduler_helper_->DefaultTaskRunner()) {
-    clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
     scheduler_helper_->SetTimeSourceForTesting(
         make_scoped_ptr(new TestTimeSource(clock_.get())));
     scheduler_helper_->GetTaskQueueManagerForTesting()->SetTimeSourceForTesting(
         make_scoped_ptr(new TestTimeSource(clock_.get())));
   }
 
   ~SchedulerHelperTest() override {}
 
   void TearDown() override {
     // Check that all tests stop posting tasks.
@@ skipping 64 matching lines @@
 
   scheduler_helper_->Shutdown();
   EXPECT_TRUE(scheduler_helper_->IsShutdown());
 }
 
 TEST_F(SchedulerHelperTest, TaskQueueIdToString) {
   CheckAllTaskQueueIdToString();
 }
 
 }  // namespace scheduler