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 bdd1f196543842399f5a2bd26cfc5b5fa07cbae2..a823a0b4806f06e87cd1da7538120c91395dd637 100644
--- a/Source/platform/scheduler/Scheduler.cpp
+++ b/Source/platform/scheduler/Scheduler.cpp
@@ -8,6 +8,7 @@
 #include "public/platform/Platform.h"
 #include "public/platform/WebScheduler.h"
 #include "public/platform/WebTraceLocation.h"
+#include "wtf/MainThread.h"
 
 namespace blink {
 
@@ -86,6 +87,14 @@ 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)
+{
+    ASSERT(WTF::isMainThread());
+
+    if (m_webScheduler)
+        m_webScheduler->postTimerTask(location, task, delayMs);
+}
+
 bool Scheduler::shouldYieldForHighPriorityWork() const
 {
     if (m_webScheduler)