[scheduler] Fix --disable-background-timer-throttling flag.

third_party/WebKit/Source/web/tests/scheduler/ThrottlingTest.cpp

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code if governed by a BSD-style license that can be
+// found in LICENSE file.
+
+#include "platform/scheduler/child/web_scheduler.h"
+#include "platform/testing/RuntimeEnabledFeaturesTestHelpers.h"
+#include "platform/testing/UnitTestHelpers.h"
+#include "public/platform/Platform.h"
+#include "public/platform/WebThread.h"
+#include "public/platform/scheduler/renderer/renderer_scheduler.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "web/tests/sim/SimRequest.h"
+#include "web/tests/sim/SimTest.h"
+
+using testing::ElementsAre;
+
+namespace blink {
+
+class DisableBackgroundThrottlingIsRespectedTest : public SimTest {
+ public:
+  void SetUp() override {
+    background_tab_timer_throttling_feature_ =
+        WTF::MakeUnique<ScopedBackgroundTabTimerThrottlingForTest>(false);
+    SimTest::SetUp();
+  }
+
+  void TearDown() { background_tab_timer_throttling_feature_.reset(); }
+
+ private:
+  typedef ScopedRuntimeEnabledFeatureForTest<
+      RuntimeEnabledFeatures::timerThrottlingForBackgroundTabsEnabled,
+      RuntimeEnabledFeatures::setTimerThrottlingForBackgroundTabsEnabled>
+      ScopedBackgroundTabTimerThrottlingForTest;
+
+  std::unique_ptr<ScopedBackgroundTabTimerThrottlingForTest>
+      background_tab_timer_throttling_feature_;
+};
+
+TEST_F(DisableBackgroundThrottlingIsRespectedTest,
+       DisableBackgroundThrottlingIsRespected) {
+  SimRequest main_resource("https://example.com/", "text/html");
+
+  LoadURL("https://example.com/");
+
+  main_resource.Complete(
+      "(<script>"
+      "  function f(repetitions) {"
+      "     if (repetitions == 0) return;"
+      "     console.log('called f');"
+      "     setTimeout(f, 10, repetitions - 1);"
+      "  }"
+      "  f(5);"
+      "</script>)");
+
+  Platform::Current()
+      ->CurrentThread()
+      ->Scheduler()
+      ->GetRendererSchedulerForTest()
+      ->OnRendererBackgrounded();
+
+  // Run delayed tasks for 1 second. All tasks should be completed
+  // with throttling disabled.
+  testing::RunDelayedTasks(1000);
+
+  EXPECT_THAT(ConsoleMessages(), ElementsAre("called f", "called f", "called f",
+                                             "called f", "called f"));
+}
+
+}  // namespace blink