cc: Add HasPendingNotification to delayed unique notifier.

cc/base/delayed_unique_notifier_unittest.cc

 // Copyright 2014 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 <deque>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/test/test_pending_task.h"
 #include "base/test/test_simple_task_runner.h"
@@ skipping 174 matching lines @@
   std::deque<base::TestPendingTask> tasks = TakePendingTasks();
 
   ASSERT_EQ(1u, tasks.size());
   EXPECT_EQ(base::TimeTicks() + delay, tasks[0].GetTimeToRun());
 
   // Time to run!
   tasks[0].task.Run();
   EXPECT_EQ(1, NotificationCount());
 }
 
-TEST_F(DelayedUniqueNotifierTest, Cancel) {
+TEST_F(DelayedUniqueNotifierTest, CancelAndHasPendingNotification) {
   base::TimeDelta delay = base::TimeDelta::FromInternalValue(20);
   TestNotifier notifier(
       task_runner_,
       base::Bind(&DelayedUniqueNotifierTest::Notify, base::Unretained(this)),
       delay);
 
   EXPECT_EQ(0, NotificationCount());
 
   // Schedule for |delay| seconds from now.
   base::TimeTicks schedule_time =
       notifier.Now() + base::TimeDelta::FromInternalValue(10);
   notifier.SetNow(schedule_time);
   notifier.Schedule();
+  EXPECT_TRUE(notifier.HasPendingNotification());
 
   // Cancel the run.
   notifier.Cancel();
+  EXPECT_FALSE(notifier.HasPendingNotification());
 
   std::deque<base::TestPendingTask> tasks = TakePendingTasks();
 
   ASSERT_EQ(1u, tasks.size());
   EXPECT_EQ(base::TimeTicks() + delay, tasks[0].GetTimeToRun());
 
   // Time to run, but a canceled task!
   tasks[0].task.Run();
   EXPECT_EQ(0, NotificationCount());
+  EXPECT_FALSE(notifier.HasPendingNotification());
 
   tasks = TakePendingTasks();
   EXPECT_EQ(0u, tasks.size());
 
   notifier.Schedule();
+  EXPECT_TRUE(notifier.HasPendingNotification());
   tasks = TakePendingTasks();
 
   ASSERT_EQ(1u, tasks.size());
   EXPECT_EQ(base::TimeTicks() + delay, tasks[0].GetTimeToRun());
 
   // Advance the time.
   notifier.SetNow(notifier.Now() + delay);
 
   // This should run since it wasn't scheduled.
   tasks[0].task.Run();
   EXPECT_EQ(1, NotificationCount());
+  EXPECT_FALSE(notifier.HasPendingNotification());
 
   for (int i = 0; i < 10; ++i)
     notifier.Schedule();
 
+  EXPECT_TRUE(notifier.HasPendingNotification());
   notifier.Cancel();

[reveman, 2014/05/30 00:19:28]

While here, can you move this Cancel() call to the loop above to make sure that
calling Schedule() and Cancel() repetitively result in only one pending task.

[vmpstr, 2014/05/30 00:38:34]

Done.

+  EXPECT_FALSE(notifier.HasPendingNotification());
   tasks = TakePendingTasks();
 
   ASSERT_EQ(1u, tasks.size());
   EXPECT_EQ(base::TimeTicks() + delay, tasks[0].GetTimeToRun());
 
   // Time to run, but a canceled task!
   notifier.SetNow(notifier.Now() + delay);
   tasks[0].task.Run();
   EXPECT_EQ(1, NotificationCount());
 
   tasks = TakePendingTasks();
   EXPECT_EQ(0u, tasks.size());
+  EXPECT_FALSE(notifier.HasPendingNotification());
 }
 
 }  // namespace
 }  // namespace cc