[scheduler] Move task alignment into WakeUpBudgetPool.

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"
@@ skipping 48 matching lines @@
       ->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"));
 }
 
+class BackgroundRendererThrottlingTest : public SimTest {};
+
+TEST_F(BackgroundRendererThrottlingTest, BackgroundRenderersAreThrottled) {
+  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);"
+      "  }"
+      "  setTimeout(f, 10, 3);"
+      "</script>)");
+
+  Platform::Current()
+      ->CurrentThread()
+      ->Scheduler()
+      ->GetRendererSchedulerForTest()
+      ->OnRendererBackgrounded();
+
+  // Make sure that we run a task once a second.
+  for (int i = 0; i < 3; ++i) {
+    testing::RunDelayedTasks(1000);
+    EXPECT_THAT(ConsoleMessages(), ElementsAre("called f"));
+    ConsoleMessages().clear();
+  }
+}
+
 }  // namespace blink