Provision to start base::SimpleTestTickClock at initial ticks

cc/test/ordered_simple_task_runner_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 <string>
 
 #include "base/cancelable_callback.h"
 #include "base/format_macros.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 39 matching lines @@
   TestOrderablePendingTask a2 = a;
   EXPECT_EQ(a, a2);
   EXPECT_LT(a2, b);
   EXPECT_LT(b, c);
   EXPECT_LT(a2, c);
 }
 
 class OrderedSimpleTaskRunnerTest : public testing::Test {
  public:
   OrderedSimpleTaskRunnerTest()
-      : now_src_(new base::SimpleTestTickClock()),
+      : now_src_(new base::SimpleTestTickClock(base::TimeTicks())),
         task_runner_(new OrderedSimpleTaskRunner(now_src_.get(), true)) {}
   ~OrderedSimpleTaskRunnerTest() override {}
 
  protected:
   std::string executed_tasks_;
   scoped_ptr<base::SimpleTestTickClock> now_src_;
   scoped_refptr<OrderedSimpleTaskRunner> task_runner_;
 
   void PostTask(int task_num, base::TimeDelta delay) {
     base::Closure test_task = base::Bind(&OrderedSimpleTaskRunnerTest::Task,
@@ skipping 364 matching lines @@
 
   task_runner_->SetRunTaskLimit(0);
   RUN_AND_CHECK_RESULT(EXPECT_TRUE, RunUntilTime(run_to), "");
 
   task_runner_->SetRunTaskLimit(100);
   RUN_AND_CHECK_RESULT(EXPECT_FALSE, RunUntilTime(run_to), "4(4ms) 5(5ms)");
   EXPECT_EQ(run_to, now_src_->NowTicks());
 }
 
 }  // namespace cc