Report expected task queueing time via UMA

components/scheduler/renderer/idle_time_estimator_unittest.cc

Index: components/scheduler/renderer/idle_time_estimator_unittest.cc
diff --git a/components/scheduler/renderer/idle_time_estimator_unittest.cc b/components/scheduler/renderer/idle_time_estimator_unittest.cc
index c50ad837240d292150338c37b4ee57b59b9cde30..1dd2ae3282985563cd40d5b37e129981635c498a 100644
--- a/components/scheduler/renderer/idle_time_estimator_unittest.cc
+++ b/components/scheduler/renderer/idle_time_estimator_unittest.cc
@@ -8,6 +8,7 @@
 #include "base/test/simple_test_tick_clock.h"
 #include "cc/test/ordered_simple_task_runner.h"
 #include "components/scheduler/base/task_queue_manager.h"
+#include "components/scheduler/base/task_time_tracker.h"
 #include "components/scheduler/base/test_time_source.h"
 #include "components/scheduler/child/scheduler_tqm_delegate_for_test.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ -31,7 +32,8 @@ class IdleTimeEstimatorForTest : public IdleTimeEstimator {
 class IdleTimeEstimatorTest : public testing::Test {
  public:
   IdleTimeEstimatorTest()
-      : frame_length_(base::TimeDelta::FromMilliseconds(16)) {}
+      : frame_length_(base::TimeDelta::FromMilliseconds(16)),
+        task_time_tracker_(nullptr) {}
 
   ~IdleTimeEstimatorTest() override {}
 
@@ -43,9 +45,9 @@ class IdleTimeEstimatorTest : public testing::Test {
         new cc::OrderedSimpleTaskRunner(clock_.get(), false));
     main_task_runner_ = SchedulerTqmDelegateForTest::Create(
         mock_task_runner_, base::WrapUnique(new TestTimeSource(clock_.get())));
-    manager_ = base::WrapUnique(
-        new TaskQueueManager(main_task_runner_, "test.scheduler",
-                             "test.scheduler", "test.scheduler.debug"));
+    manager_ = base::WrapUnique(new TaskQueueManager(
+        main_task_runner_, "test.scheduler", "test.scheduler",
+        "test.scheduler.debug"));
     compositor_task_runner_ =
         manager_->NewTaskQueue(TaskQueue::Spec("compositor_tq"));
     estimator_.reset(new IdleTimeEstimatorForTest(
@@ -92,6 +94,7 @@ class IdleTimeEstimatorTest : public testing::Test {
   scoped_refptr<TaskQueue> compositor_task_runner_;
   std::unique_ptr<IdleTimeEstimatorForTest> estimator_;
   const base::TimeDelta frame_length_;
+  TaskTimeTracker task_time_tracker_;
 };
 
 TEST_F(IdleTimeEstimatorTest, InitialTimeEstimateWithNoData) {