Provision to start base::SimpleTestTickClock at initial ticks

media/cast/receiver/frame_receiver_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 <stddef.h>
 #include <stdint.h>
 
 #include <deque>
 
 #include "base/bind.h"
@@ skipping 51 matching lines @@
   std::deque<std::pair<uint32_t, base::TimeTicks>> expected_results_;
   int num_called_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeFrameClient);
 };
 }  // namespace
 
 class FrameReceiverTest : public ::testing::Test {
  protected:
   FrameReceiverTest() {
-    testing_clock_ = new base::SimpleTestTickClock();
-    testing_clock_->Advance(base::TimeTicks::Now() - base::TimeTicks());
+    testing_clock_ = new base::SimpleTestTickClock(base::TimeTicks::Now());
     start_time_ = testing_clock_->NowTicks();
     task_runner_ = new test::FakeSingleThreadTaskRunner(testing_clock_);
 
     cast_environment_ =
         new CastEnvironment(scoped_ptr<base::TickClock>(testing_clock_),
                             task_runner_, task_runner_, task_runner_);
   }
 
   ~FrameReceiverTest() override {}
 
@@ skipping 328 matching lines @@
     EXPECT_GE(kFirstFrameId + 3, frame_events[i].frame_id);
     const int frame_offset = frame_events[i].frame_id - kFirstFrameId;
     EXPECT_EQ(frame_offset * rtp_advance_per_frame,
               frame_events[i].rtp_timestamp);
   }
   cast_environment_->logger()->Unsubscribe(&event_subscriber);
 }
 
 }  // namespace cast
 }  // namespace media