Provision to start base::SimpleTestTickClock at initial ticks

media/filters/video_renderer_algorithm_unittest.cc

 // Copyright 2015 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 <cmath>
 
 #include "base/bind.h"
@@ skipping 50 matching lines @@
   const double hertz_;
   const double microseconds_per_tick_;
   base::TimeTicks base_time_;
 
   DISALLOW_COPY_AND_ASSIGN(TickGenerator);
 };
 
 class VideoRendererAlgorithmTest : public testing::Test {
  public:
   VideoRendererAlgorithmTest()
-      : tick_clock_(new base::SimpleTestTickClock()),
+      // Always start the TickClock at a non-zero value since null values have
+      // special connotations.
+      : tick_clock_(new base::SimpleTestTickClock(
+            base::TimeTicks() + base::TimeDelta::FromMicroseconds(10000))),
         algorithm_(base::Bind(&WallClockTimeSource::GetWallClockTimes,
                               base::Unretained(&time_source_))) {
-    // Always start the TickClock at a non-zero value since null values have
-    // special connotations.
-    tick_clock_->Advance(base::TimeDelta::FromMicroseconds(10000));
     time_source_.set_tick_clock_for_testing(tick_clock_.get());
   }
   ~VideoRendererAlgorithmTest() override {}
 
   scoped_refptr<VideoFrame> CreateFrame(base::TimeDelta timestamp) {
     const gfx::Size natural_size(8, 8);
     return frame_pool_.CreateFrame(PIXEL_FORMAT_YV12, natural_size,
                                    gfx::Rect(natural_size), natural_size,
                                    timestamp);
   }
@@ skipping 1301 matching lines @@
   ASSERT_TRUE(is_using_cadence());
 
   // Finally the last frame.
   rendered_frame = RenderAndStep(&tg, &frames_dropped);
   EXPECT_EQ(1u, frames_queued());
   EXPECT_EQ(tg.interval(12), rendered_frame->timestamp());
   ASSERT_TRUE(is_using_cadence());
 }
 
 }  // namespace media