Provision to start base::SimpleTestTickClock at initial ticks

cc/scheduler/begin_frame_source_unittest.cc

 // Copyright 2011 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 "cc/scheduler/begin_frame_source.h"
 
 #include <stdint.h>
 
 #include "base/test/test_simple_task_runner.h"
 #include "cc/test/begin_frame_args_test.h"
@@ skipping 170 matching lines @@
  public:
   static const int64_t kDeadline;
   static const int64_t kInterval;
 
   scoped_ptr<base::SimpleTestTickClock> now_src_;
   scoped_refptr<OrderedSimpleTaskRunner> task_runner_;
   scoped_ptr<TestBackToBackBeginFrameSource> source_;
   scoped_ptr<MockBeginFrameObserver> obs_;
 
   void SetUp() override {
-    now_src_.reset(new base::SimpleTestTickClock());
-    now_src_->Advance(base::TimeDelta::FromMicroseconds(1000));
+    now_src_.reset(new base::SimpleTestTickClock(
+        base::TimeTicks() + base::TimeDelta::FromMicroseconds(1000)));
     task_runner_ =
         make_scoped_refptr(new OrderedSimpleTaskRunner(now_src_.get(), false));
     task_runner_->SetRunTaskLimit(1);
     source_ = TestBackToBackBeginFrameSource::Create(now_src_.get(),
                                                      task_runner_.get());
     obs_ = make_scoped_ptr(new ::testing::StrictMock<MockBeginFrameObserver>());
     source_->AddObserver(obs_.get());
   }
 
   void TearDown() override { obs_.reset(); }
@@ skipping 145 matching lines @@
 
 // SyntheticBeginFrameSource testing ------------------------------------------
 class SyntheticBeginFrameSourceTest : public ::testing::Test {
  public:
   scoped_ptr<base::SimpleTestTickClock> now_src_;
   scoped_refptr<OrderedSimpleTaskRunner> task_runner_;
   scoped_ptr<TestSyntheticBeginFrameSource> source_;
   scoped_ptr<MockBeginFrameObserver> obs_;
 
   void SetUp() override {
-    now_src_.reset(new base::SimpleTestTickClock());
-    now_src_->Advance(base::TimeDelta::FromMicroseconds(1000));
+    now_src_.reset(new base::SimpleTestTickClock(
+        base::TimeTicks() + base::TimeDelta::FromMicroseconds(1000)));
     task_runner_ =
         make_scoped_refptr(new OrderedSimpleTaskRunner(now_src_.get(), false));
     source_ = TestSyntheticBeginFrameSource::Create(
         now_src_.get(), task_runner_.get(),
         base::TimeDelta::FromMicroseconds(10000));
     obs_ = make_scoped_ptr(new MockBeginFrameObserver());
     source_->AddObserver(obs_.get());
   }
 
   void TearDown() override { obs_.reset(); }
@@ skipping 246 matching lines @@
   mux_->SetActiveSource(source2_);
   SEND_BEGIN_FRAME_DROP(*source2_, 750, 1050, 300);
   SEND_BEGIN_FRAME_USED(*source2_, 1050, 1250, 300);
 
   mux_->SetActiveSource(source1_);
   SEND_BEGIN_FRAME_DROP(*source2_, 1100, 1400, 300);
 }
 
 }  // namespace
 }  // namespace cc