Add a flag disable background timer alignment

components/scheduler/renderer/web_view_scheduler_impl_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 "components/scheduler/renderer/web_view_scheduler_impl.h"
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "cc/test/ordered_simple_task_runner.h"
@@ skipping 13 matching lines @@
   ~WebViewSchedulerImplTest() override {}
 
   void SetUp() override {
     clock_.reset(new base::SimpleTestTickClock());
     clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
     mock_task_runner_ =
         make_scoped_refptr(new cc::OrderedSimpleTaskRunner(clock_.get(), true));
     delagate_ = SchedulerTqmDelegateForTest::Create(
         mock_task_runner_, make_scoped_ptr(new TestTimeSource(clock_.get())));
     scheduler_.reset(new RendererSchedulerImpl(delagate_));
-    web_view_scheduler_.reset(
-        new WebViewSchedulerImpl(nullptr, scheduler_.get()));
+    web_view_scheduler_.reset(new WebViewSchedulerImpl(
+        nullptr, scheduler_.get(), DisableBackgroundTimerThrottling()));
     web_frame_scheduler_ = web_view_scheduler_->createWebFrameSchedulerImpl();
   }
 
   void TearDown() override {
     web_frame_scheduler_.reset();
     web_view_scheduler_.reset();
     scheduler_->Shutdown();
     scheduler_.reset();
   }
 
+  virtual bool DisableBackgroundTimerThrottling() const { return false; }
+
   scoped_ptr<base::SimpleTestTickClock> clock_;
   scoped_refptr<cc::OrderedSimpleTaskRunner> mock_task_runner_;
   scoped_refptr<SchedulerTqmDelegate> delagate_;
   scoped_ptr<RendererSchedulerImpl> scheduler_;
   scoped_ptr<WebViewSchedulerImpl> web_view_scheduler_;
   scoped_ptr<WebFrameSchedulerImpl> web_frame_scheduler_;
 };
 
 TEST_F(WebViewSchedulerImplTest, TestDestructionOfFrameSchedulersBefore) {
   blink::WebPassOwnPtr<blink::WebFrameScheduler> frame1(
@@ skipping 64 matching lines @@
       BLINK_FROM_HERE,
       new RepeatingTask(web_frame_scheduler_->loadingTaskRunner(), &run_count),
       1.0);
 
   mock_task_runner_->RunForPeriod(base::TimeDelta::FromSeconds(1));
   EXPECT_EQ(1000, run_count);  // Loading tasks should not be throttled
 }
 
 TEST_F(WebViewSchedulerImplTest, RepeatingTimers_OneBackgroundOneForeground) {
   scoped_ptr<WebViewSchedulerImpl> web_view_scheduler2(
-      new WebViewSchedulerImpl(nullptr, scheduler_.get()));
+      new WebViewSchedulerImpl(nullptr, scheduler_.get(), false));
   scoped_ptr<WebFrameSchedulerImpl> web_frame_scheduler2 =
       web_view_scheduler2->createWebFrameSchedulerImpl();
 
   web_view_scheduler_->setPageInBackground(false);
   web_view_scheduler2->setPageInBackground(true);
 
   int run_count1 = 0;
   int run_count2 = 0;
   web_frame_scheduler_->timerTaskRunner()->postDelayedTask(
       BLINK_FROM_HERE,
       new RepeatingTask(web_frame_scheduler_->timerTaskRunner(), &run_count1),
       1.0);
   web_frame_scheduler2->timerTaskRunner()->postDelayedTask(
       BLINK_FROM_HERE,
       new RepeatingTask(web_frame_scheduler2->timerTaskRunner(), &run_count2),
       1.0);
 
   mock_task_runner_->RunForPeriod(base::TimeDelta::FromSeconds(1));
   EXPECT_EQ(1000, run_count1);
   EXPECT_EQ(1, run_count2);
 }
 
+class WebViewSchedulerImplTestWithDisabledBackgroundTimerThrottling
+    : public WebViewSchedulerImplTest {
+ public:
+  WebViewSchedulerImplTestWithDisabledBackgroundTimerThrottling() {}
+  ~WebViewSchedulerImplTestWithDisabledBackgroundTimerThrottling() override {}
+
+  bool DisableBackgroundTimerThrottling() const override { return true; }
+};
+
+TEST_F(WebViewSchedulerImplTestWithDisabledBackgroundTimerThrottling,
+       RepeatingTimer_PageInBackground) {
+  web_view_scheduler_->setPageInBackground(true);
+
+  int run_count = 0;
+  web_frame_scheduler_->timerTaskRunner()->postDelayedTask(
+      BLINK_FROM_HERE,
+      new RepeatingTask(web_frame_scheduler_->timerTaskRunner(), &run_count),
+      1.0);
+
+  mock_task_runner_->RunForPeriod(base::TimeDelta::FromSeconds(1));
+  EXPECT_EQ(1000, run_count);
+}
+
 }  // namespace scheduler