Optimize for TouchStart responsiveness

components/scheduler/renderer/task_cost_estimator_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 "base/test/simple_test_tick_clock.h"
 #include "components/scheduler/renderer/task_cost_estimator.h"
 
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 26 matching lines @@
 TEST_F(TaskCostEstimatorTest, BasicEstimation) {
   TaskCostEstimatorForTest estimator(&clock_, 1, 100);
   base::PendingTask task(FROM_HERE, base::Closure());
 
   estimator.WillProcessTask(task);
   clock_.Advance(base::TimeDelta::FromMilliseconds(500));
   estimator.DidProcessTask(task);
 
   EXPECT_EQ(base::TimeDelta::FromMilliseconds(500),
             estimator.expected_task_duration());
-};
+}
+
+TEST_F(TaskCostEstimatorTest, Clear) {
+  TaskCostEstimatorForTest estimator(&clock_, 1, 100);
+  base::PendingTask task(FROM_HERE, base::Closure());
+
+  estimator.WillProcessTask(task);
+  clock_.Advance(base::TimeDelta::FromMilliseconds(500));
+  estimator.DidProcessTask(task);
+
+  estimator.Clear();
+
+  EXPECT_EQ(base::TimeDelta(), estimator.expected_task_duration());
+}
 
 TEST_F(TaskCostEstimatorTest, NestedRunLoop) {
   TaskCostEstimatorForTest estimator(&clock_, 1, 100);
   base::PendingTask task(FROM_HERE, base::Closure());
 
   // Make sure we ignore the tasks inside the nested run loop.
   estimator.WillProcessTask(task);
   estimator.WillProcessTask(task);
   clock_.Advance(base::TimeDelta::FromMilliseconds(500));
   estimator.DidProcessTask(task);
   clock_.Advance(base::TimeDelta::FromMilliseconds(500));
   estimator.DidProcessTask(task);
 
   EXPECT_EQ(base::TimeDelta::FromMilliseconds(1000),
             estimator.expected_task_duration());
-};
+}
 
 }  // namespace scheduler