Provision to start base::SimpleTestTickClock at initial ticks

cc/test/ordered_simple_task_runner_unittest.cc

Index: cc/test/ordered_simple_task_runner_unittest.cc
diff --git a/cc/test/ordered_simple_task_runner_unittest.cc b/cc/test/ordered_simple_task_runner_unittest.cc
index 437235ea1d3a6923af6004b2b4ae2ee9cd3bc9b0..97c1974d0370d9b2dd510ff69ffa6ec9f47b736c 100644
--- a/cc/test/ordered_simple_task_runner_unittest.cc
+++ b/cc/test/ordered_simple_task_runner_unittest.cc
@@ -295,7 +295,9 @@ TEST_F(OrderedSimpleTaskRunnerTest, RunUntilTimeAutoNow) {
 
   task_runner_->SetAutoAdvanceNowToPendingTasks(true);
 
-  base::TimeTicks run_at = base::TimeTicks();
+  // SimpleTestTickClock starts at 1 microsecond
+  base::TimeTicks run_at =
+      base::TimeTicks() + base::TimeDelta::FromMicroseconds(1);
 
   run_at += base::TimeDelta::FromMilliseconds(2);
   RUN_AND_CHECK_RESULT(
@@ -318,7 +320,9 @@ TEST_F(OrderedSimpleTaskRunnerTest, RunUntilTimeManualNow) {
 
   task_runner_->SetAutoAdvanceNowToPendingTasks(false);
 
-  base::TimeTicks run_at = base::TimeTicks();
+  // SimpleTestTickClock starts at 1 microsecond
+  base::TimeTicks run_at =
+      base::TimeTicks() + base::TimeDelta::FromMicroseconds(1);
 
   run_at += base::TimeDelta::FromMilliseconds(2);
   RUN_AND_CHECK_RESULT(
@@ -342,18 +346,22 @@ TEST_F(OrderedSimpleTaskRunnerTest, RunForPeriod) {
   RUN_AND_CHECK_RESULT(EXPECT_TRUE,
                        RunForPeriod(base::TimeDelta::FromMilliseconds(2)),
                        "1(0ms) -1(0ms) 2(2ms) -2(2ms)");
-  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMilliseconds(2),
+  // SimpleTestTickClock starts at 1 microsecond
+  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1) +
+                base::TimeDelta::FromMilliseconds(2),
             now_src_->NowTicks());
 
   RUN_AND_CHECK_RESULT(EXPECT_FALSE,
                        RunForPeriod(base::TimeDelta::FromMilliseconds(1)),
                        "3(3ms) -3(3ms)");
-  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMilliseconds(3),
+  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1) +
+                base::TimeDelta::FromMilliseconds(3),
             now_src_->NowTicks());
 
   RUN_AND_CHECK_RESULT(
       EXPECT_FALSE, RunForPeriod(base::TimeDelta::FromMilliseconds(1)), "");
-  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMilliseconds(4),
+  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1) +
+                base::TimeDelta::FromMilliseconds(4),
             now_src_->NowTicks());
 }
 
@@ -371,7 +379,9 @@ TEST_F(OrderedSimpleTaskRunnerTest, EmptyTaskList) {
   RUN_AND_CHECK_RESULT(EXPECT_FALSE, RunPendingTasks(), "");
   RUN_AND_CHECK_RESULT(EXPECT_FALSE, RunUntilIdle(), "");
 
-  ASSERT_EQ(base::TimeTicks(), now_src_->NowTicks());
+  // SimpleTestTickClock starts at 1 microsecond
+  ASSERT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1),
+            now_src_->NowTicks());
 
   RUN_AND_CHECK_RESULT(
       EXPECT_FALSE, RunUntilTime(base::TimeTicks::FromInternalValue(100)), "");
@@ -417,7 +427,10 @@ TEST_F(OrderedSimpleTaskRunnerTest, RunUntilIdleTimeout) {
 }
 
 TEST_F(OrderedSimpleTaskRunnerTest, RunUntilTimeout) {
-  base::TimeTicks run_to = base::TimeTicks() + base::TimeDelta::FromSeconds(1);
+  // SimpleTestTickClock starts at 1 microsecond
+  base::TimeTicks run_to = base::TimeTicks() +
+                           base::TimeDelta::FromMicroseconds(1) +
+                           base::TimeDelta::FromSeconds(1);
 
   PostTask(1, base::TimeDelta::FromMilliseconds(1));
   PostTask(2, base::TimeDelta::FromMilliseconds(2));
@@ -425,11 +438,13 @@ TEST_F(OrderedSimpleTaskRunnerTest, RunUntilTimeout) {
   PostTask(4, base::TimeDelta::FromMilliseconds(4));
   PostTask(5, base::TimeDelta::FromMilliseconds(5));
 
-  EXPECT_EQ(base::TimeTicks(), now_src_->NowTicks());
+  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1),
+            now_src_->NowTicks());
   task_runner_->SetRunTaskLimit(3);
   RUN_AND_CHECK_RESULT(
       EXPECT_TRUE, RunUntilTime(run_to), "1(1ms) 2(2ms) 3(3ms)");
-  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMilliseconds(3),
+  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1) +
+                base::TimeDelta::FromMilliseconds(3),
             now_src_->NowTicks());
 
   task_runner_->SetRunTaskLimit(0);