Record PendingTaskCount when a backgrounded renderer is suspended.

third_party/WebKit/Source/platform/scheduler/child/scheduler_helper_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 "platform/scheduler/child/scheduler_helper.h"
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/test/simple_test_tick_clock.h"
@@ skipping 119 matching lines @@
   EXPECT_TRUE(scheduler_helper_->IsShutdown());
 }
 
 TEST_F(SchedulerHelperTest, DefaultTaskRunnerRegistration) {
   EXPECT_EQ(main_task_runner_->default_task_runner(),
             scheduler_helper_->DefaultTaskRunner());
   scheduler_helper_->Shutdown();
   EXPECT_EQ(nullptr, main_task_runner_->default_task_runner());
 }
 
+TEST_F(SchedulerHelperTest, GetNumberOfPendingTasks) {
+  std::vector<std::string> run_order;
+  scheduler_helper_->DefaultTaskRunner()->PostTask(
+      FROM_HERE, base::Bind(&AppendToVectorTestTask, &run_order, "D1"));
+  scheduler_helper_->DefaultTaskRunner()->PostTask(
+      FROM_HERE, base::Bind(&AppendToVectorTestTask, &run_order, "D2"));
+  scheduler_helper_->ControlTaskRunner()->PostTask(
+      FROM_HERE, base::Bind(&AppendToVectorTestTask, &run_order, "C1"));
+  EXPECT_EQ(3U, scheduler_helper_->GetNumberOfPendingTasks());
+  RunUntilIdle();
+  EXPECT_EQ(0U, scheduler_helper_->GetNumberOfPendingTasks());
+}
+
 namespace {
 class MockTaskObserver : public base::MessageLoop::TaskObserver {
  public:
   MOCK_METHOD1(DidProcessTask, void(const base::PendingTask& task));
   MOCK_METHOD1(WillProcessTask, void(const base::PendingTask& task));
 };
 
 void NopTask() {}
 }  // namespace
 
@@ skipping 61 matching lines @@
   task_queue->SetQueueEnabled(false);
 
   EXPECT_CALL(observer, OnTriedToExecuteBlockedTask(_, _)).Times(1);
   RunUntilIdle();
 
   scheduler_helper_->SetObserver(nullptr);
 }
 
 }  // namespace scheduler
 }  // namespace blink