Record the TaskLatency Histogram in Microseconds Instead of Milliseconds

base/task_scheduler/task_tracker_unittest.cc

 // Copyright 2016 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/task_scheduler/task_tracker.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <utility>
@@ skipping 895 matching lines @@
 TEST(TaskSchedulerTaskTrackerHistogramTest, TaskLatency) {
   auto statistics_recorder = StatisticsRecorder::CreateTemporaryForTesting();
 
   TaskTracker tracker;
 
   struct {
     const TaskTraits traits;
     const char* const expected_histogram;
   } tests[] = {
       {TaskTraits().WithPriority(TaskPriority::BACKGROUND),
-       "TaskScheduler.TaskLatency.BackgroundTaskPriority"},
+       "TaskScheduler.TaskLatencyMicroseconds.BackgroundTaskPriority"},
       {TaskTraits().WithPriority(TaskPriority::BACKGROUND).MayBlock(),
-       "TaskScheduler.TaskLatency.BackgroundTaskPriority.MayBlock"},
+       "TaskScheduler.TaskLatencyMicroseconds.BackgroundTaskPriority.MayBlock"},
       {TaskTraits()
            .WithPriority(TaskPriority::BACKGROUND)
            .WithBaseSyncPrimitives(),
-       "TaskScheduler.TaskLatency.BackgroundTaskPriority.MayBlock"},
+       "TaskScheduler.TaskLatencyMicroseconds.BackgroundTaskPriority.MayBlock"},
       {TaskTraits().WithPriority(TaskPriority::USER_VISIBLE),
-       "TaskScheduler.TaskLatency.UserVisibleTaskPriority"},
+       "TaskScheduler.TaskLatencyMicroseconds.UserVisibleTaskPriority"},
       {TaskTraits().WithPriority(TaskPriority::USER_VISIBLE).MayBlock(),
-       "TaskScheduler.TaskLatency.UserVisibleTaskPriority.MayBlock"},
+       "TaskScheduler.TaskLatencyMicroseconds.UserVisibleTaskPriority."
+       "MayBlock"},
       {TaskTraits()
            .WithPriority(TaskPriority::USER_VISIBLE)
            .WithBaseSyncPrimitives(),
-       "TaskScheduler.TaskLatency.UserVisibleTaskPriority.MayBlock"},
+       "TaskScheduler.TaskLatencyMicroseconds.UserVisibleTaskPriority."
+       "MayBlock"},
       {TaskTraits().WithPriority(TaskPriority::USER_BLOCKING),
-       "TaskScheduler.TaskLatency.UserBlockingTaskPriority"},
+       "TaskScheduler.TaskLatencyMicroseconds.UserBlockingTaskPriority"},
       {TaskTraits().WithPriority(TaskPriority::USER_BLOCKING).MayBlock(),
-       "TaskScheduler.TaskLatency.UserBlockingTaskPriority.MayBlock"},
+       "TaskScheduler.TaskLatencyMicroseconds.UserBlockingTaskPriority."
+       "MayBlock"},
       {TaskTraits()
            .WithPriority(TaskPriority::USER_BLOCKING)
            .WithBaseSyncPrimitives(),
-       "TaskScheduler.TaskLatency.UserBlockingTaskPriority.MayBlock"}};
+       "TaskScheduler.TaskLatencyMicroseconds.UserBlockingTaskPriority."
+       "MayBlock"}};
 
   for (const auto& test : tests) {
     auto task =
         MakeUnique<Task>(FROM_HERE, Bind(&DoNothing), test.traits, TimeDelta());
     ASSERT_TRUE(tracker.WillPostTask(task.get()));
 
     HistogramTester tester;
     EXPECT_TRUE(tracker.RunTask(std::move(task), SequenceToken::Create()));
     tester.ExpectTotalCount(test.expected_histogram, 1);
   }
 }
 
 }  // namespace internal
 }  // namespace base