Modify the scheduler to queue idle work between idle periods.

Source/platform/scheduler/SchedulerTest.cpp

Index: Source/platform/scheduler/SchedulerTest.cpp
diff --git a/Source/platform/scheduler/SchedulerTest.cpp b/Source/platform/scheduler/SchedulerTest.cpp
index aa708556f5ee3b221c503c5a912dbde5a83681fc..548146e2ce99cf91a3aafc533c660a8f39c217d6 100644
--- a/Source/platform/scheduler/SchedulerTest.cpp
+++ b/Source/platform/scheduler/SchedulerTest.cpp
@@ -257,6 +257,13 @@ void idleTestTask(bool* taskRun, double expectedDeadline, double deadlineSeconds
     *taskRun = true;
 }
 
+void repostingIdleTestTask(Scheduler* scheduler, int* runCount, double deadlineSeconds)
+{
+    if (*runCount == 0)
+        scheduler->postIdleTask(FROM_HERE, WTF::bind<double>(&repostingIdleTestTask, scheduler, runCount));
+    (*runCount)++;
+}
+
 TEST_F(SchedulerTest, TestPostTask)
 {
     int result = 0;
@@ -332,6 +339,24 @@ TEST_F(SchedulerTest, TestIdleTask)
     EXPECT_TRUE(taskRun);
 }
 
+TEST_F(SchedulerTest, TestRepostingIdleTask)
+{
+    int runCount = 0;
+
+    m_scheduler->postIdleTask(FROM_HERE, WTF::bind<double>(&repostingIdleTestTask, m_scheduler, &runCount));
+
+    enableIdleTasks();
+    runPendingTasks();
+    EXPECT_EQ(1, runCount);
+
+    runPendingTasks();
+    EXPECT_EQ(1, runCount); // Reposted tasks shouldn't run until next idle period.
+
+    enableIdleTasks();
+    runPendingTasks();
+    EXPECT_EQ(2, runCount);
+}
+
 TEST_F(SchedulerTest, TestTaskPrioritization_normalPolicy)
 {
     m_scheduler->postTask(FROM_HERE, WTF::bind(&SchedulerTest::appendToVector, this, std::string("L1")));