Provision to start base::SimpleTestTickClock at initial ticks

media/base/time_delta_interpolator_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/logging.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "media/base/time_delta_interpolator.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace media {
 
 class TimeDeltaInterpolatorTest : public ::testing::Test {
  public:
-  TimeDeltaInterpolatorTest() : interpolator_(&test_tick_clock_) {}
+  TimeDeltaInterpolatorTest()
+      : test_tick_clock_(base::TimeTicks()), interpolator_(&test_tick_clock_) {}
 
  protected:
   void AdvanceSystemTime(base::TimeDelta delta) {
     test_tick_clock_.Advance(delta);
   }
 
   base::SimpleTestTickClock test_tick_clock_;
   TimeDeltaInterpolator interpolator_;
 };
 
@@ skipping 165 matching lines @@
   EXPECT_EQ(kMaxTime1, interpolator_.GetInterpolatedTime());
 
   AdvanceSystemTime(kTimeInterval);
   EXPECT_EQ(kMaxTime1 + kTimeInterval, interpolator_.GetInterpolatedTime());
 
   AdvanceSystemTime(kTimeInterval);
   EXPECT_EQ(kMaxTime2, interpolator_.GetInterpolatedTime());
 }
 
 }  // namespace media