Provision to start base::SimpleTestTickClock at initial ticks

media/base/wall_clock_time_source_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 "base/macros.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "media/base/wall_clock_time_source.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace media {
 
 class WallClockTimeSourceTest : public testing::Test {
  public:
-  WallClockTimeSourceTest() : tick_clock_(new base::SimpleTestTickClock()) {
+  WallClockTimeSourceTest()
+      : tick_clock_(new base::SimpleTestTickClock(
+            base::TimeTicks() + base::TimeDelta::FromSeconds(1))) {
     time_source_.set_tick_clock_for_testing(tick_clock_.get());
-    AdvanceTimeInSeconds(1);
   }
   ~WallClockTimeSourceTest() override {}
 
   void AdvanceTimeInSeconds(int seconds) {
     tick_clock_->Advance(base::TimeDelta::FromSeconds(seconds));
   }
 
   int CurrentMediaTimeInSeconds() {
     return time_source_.CurrentMediaTime().InSeconds();
   }
@@ skipping 130 matching lines @@
 
   wall_clock_times.clear();
   time_source_.StopTicking();
   is_time_moving = time_source_.GetWallClockTimes(
       std::vector<base::TimeDelta>(), &wall_clock_times);
   EXPECT_FALSE(is_time_moving);
   EXPECT_EQ(tick_clock_->NowTicks(), wall_clock_times[0]);
 }
 
 }  // namespace media