Refactor TimeBase to post tasks. Workers to use real Idle tasks.

Source/platform/scheduler/Scheduler.cpp

Index: Source/platform/scheduler/Scheduler.cpp
diff --git a/Source/platform/scheduler/Scheduler.cpp b/Source/platform/scheduler/Scheduler.cpp
index 2beaf11362b3efda681c4b66b13883a8296be983..73d5df733d2b08afa964fb61bbe586b4c8ed6d20 100644
--- a/Source/platform/scheduler/Scheduler.cpp
+++ b/Source/platform/scheduler/Scheduler.cpp
@@ -77,6 +77,12 @@ void Scheduler::postLoadingTask(const WebTraceLocation& location, WebThread::Tas
         m_webScheduler->postLoadingTask(location, task);
 }
 
+void Scheduler::postTimerTask(const WebTraceLocation& location, WebThread::Task* task, long long delayMs)
+{
+    if (m_webScheduler)
+        m_webScheduler->postTimerTask(location, task, delayMs);
+}
+
 bool Scheduler::shouldYieldForHighPriorityWork() const
 {
     if (m_webScheduler)