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/macros.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "cc/test/ordered_simple_task_runner.h"
@@ skipping 27 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)),
         main_task_runner_(SchedulerTqmDelegateForTest::Create(
             mock_task_runner_,
             make_scoped_ptr(new TestTimeSource(clock_.get())))),
         scheduler_helper_(new SchedulerHelper(
             main_task_runner_,
             "test.scheduler",
             TRACE_DISABLED_BY_DEFAULT("test.scheduler"),
             TRACE_DISABLED_BY_DEFAULT("test.scheduler.dbg"))),
-        default_task_runner_(scheduler_helper_->DefaultTaskRunner()) {
-    clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
-  }
+        default_task_runner_(scheduler_helper_->DefaultTaskRunner()) {}
 
   ~SchedulerHelperTest() override {}
 
   void TearDown() override {
     // Check that all tests stop posting tasks.
     mock_task_runner_->SetAutoAdvanceNowToPendingTasks(true);
     while (mock_task_runner_->RunUntilIdle()) {
     }
   }
 
@@ skipping 127 matching lines @@
   scoped_refptr<TaskQueue> task_queue =
       scheduler_helper_->NewTaskQueue(TaskQueue::Spec("test_queue"));
 
   EXPECT_CALL(observer, OnUnregisterTaskQueue(_)).Times(1);
   task_queue->UnregisterTaskQueue();
 
   scheduler_helper_->SetObserver(nullptr);
 }
 
 }  // namespace scheduler