Don't throttle web views until they've been in the background for 10s

third_party/WebKit/Source/platform/scheduler/renderer/web_frame_scheduler_impl_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 "platform/scheduler/renderer/web_frame_scheduler_impl.h"
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/memory/ptr_util.h"
@@ skipping 85 matching lines @@
   RuntimeEnabledFeatures::setTimerThrottlingForHiddenFramesEnabled(true);
   web_view_scheduler_->setPageVisible(false);
 
   int run_count = 0;
   web_frame_scheduler_->timerTaskRunner()->postDelayedTask(
       BLINK_FROM_HERE,
       makeRepeatingTask(web_frame_scheduler_->timerTaskRunner(), &run_count),
       1.0);
 
   mock_task_runner_->RunForPeriod(base::TimeDelta::FromSeconds(1));
+  EXPECT_EQ(1000, run_count);
+
+  // The task queue isn't throttled at all until it's been in the background for
+  // a 10 second grace period.
+  clock_->Advance(base::TimeDelta::FromSeconds(10));
+
+  run_count = 0;
+  mock_task_runner_->RunForPeriod(base::TimeDelta::FromSeconds(1));
   EXPECT_EQ(1, run_count);
 }
 
 TEST_F(WebFrameSchedulerImplTest, RepeatingTimer_FrameHidden_SameOrigin) {
   RuntimeEnabledFeatures::setTimerThrottlingForHiddenFramesEnabled(true);
   web_frame_scheduler_->setFrameVisible(false);
 
   int run_count = 0;
   web_frame_scheduler_->timerTaskRunner()->postDelayedTask(
       BLINK_FROM_HERE,
@@ skipping 38 matching lines @@
   RuntimeEnabledFeatures::setTimerThrottlingForHiddenFramesEnabled(false);
   web_view_scheduler_->setPageVisible(false);
 
   int run_count = 0;
   web_frame_scheduler_->timerTaskRunner()->postDelayedTask(
       BLINK_FROM_HERE,
       makeRepeatingTask(web_frame_scheduler_->timerTaskRunner(), &run_count),
       1.0);
 
   mock_task_runner_->RunForPeriod(base::TimeDelta::FromSeconds(1));
+  EXPECT_EQ(1000, run_count);
+
+  // The task queue isn't throttled at all until it's been in the background for
+  // a 10 second grace period.
+  clock_->Advance(base::TimeDelta::FromSeconds(10));
+
+  run_count = 0;
+  mock_task_runner_->RunForPeriod(base::TimeDelta::FromSeconds(1));
   EXPECT_EQ(1, run_count);
 }
 
-TEST_F(WebFrameSchedulerImplTest, RepeatingTimer_FrameHidden_CrossOrigin_ThrottlingDisabled) {
+TEST_F(WebFrameSchedulerImplTest,
+       RepeatingTimer_FrameHidden_CrossOrigin_ThrottlingDisabled) {
   RuntimeEnabledFeatures::setTimerThrottlingForHiddenFramesEnabled(false);
   web_frame_scheduler_->setFrameVisible(false);
   web_frame_scheduler_->setCrossOrigin(true);
 
   int run_count = 0;
   web_frame_scheduler_->timerTaskRunner()->postDelayedTask(
       BLINK_FROM_HERE,
       makeRepeatingTask(web_frame_scheduler_->timerTaskRunner(), &run_count),
       1.0);
 
@@ skipping 18 matching lines @@
 
   web_frame_scheduler_->setSuspended(false);
 
   EXPECT_EQ(1, counter);
   mock_task_runner_->RunUntilIdle();
   EXPECT_EQ(3, counter);
 }
 
 }  // namespace scheduler
 }  // namespace blink