Provision to start base::SimpleTestTickClock at initial ticks

media/blink/video_frame_compositor_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/bind.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "cc/layers/video_frame_provider.h"
@@ skipping 10 matching lines @@
 
 ACTION_P(RunClosure, closure) {
   closure.Run();
 }
 
 class VideoFrameCompositorTest : public testing::Test,
                                  public cc::VideoFrameProvider::Client,
                                  public VideoRendererSink::RenderCallback {
  public:
   VideoFrameCompositorTest()
-      : tick_clock_(new base::SimpleTestTickClock()),
+      : tick_clock_(new base::SimpleTestTickClock(base::TimeTicks())),
         compositor_(new VideoFrameCompositor(
             message_loop.task_runner(),
             base::Bind(&VideoFrameCompositorTest::NaturalSizeChanged,
                        base::Unretained(this)),
             base::Bind(&VideoFrameCompositorTest::OpacityChanged,
                        base::Unretained(this)))),
         did_receive_frame_count_(0),
         natural_size_changed_count_(0),
         opacity_changed_count_(0),
         opaque_(false) {
@@ skipping 384 matching lines @@
 
   // Advancing the tick clock should allow a new frame to be requested.
   tick_clock_->Advance(base::TimeDelta::FromMilliseconds(10));
   ASSERT_EQ(opaque_frame_2, compositor()->GetCurrentFrameAndUpdateIfStale());
 
   // Background rendering should tick another render callback.
   StopVideoRendererSink(false);
 }
 
 }  // namespace media