[TimeZoneMonitor] Decouple renderer side impl from content to blink.

third_party/WebKit/Source/core/workers/WorkerThread.cpp

Index: third_party/WebKit/Source/core/workers/WorkerThread.cpp
diff --git a/third_party/WebKit/Source/core/workers/WorkerThread.cpp b/third_party/WebKit/Source/core/workers/WorkerThread.cpp
index f03dfb3508ee3a50d82574df321b0017c5fc9281..3b4554bace4b3c9ab95ed8be1ea38e5816b43036 100644
--- a/third_party/WebKit/Source/core/workers/WorkerThread.cpp
+++ b/third_party/WebKit/Source/core/workers/WorkerThread.cpp
@@ -320,6 +320,18 @@ unsigned WorkerThread::workerThreadCount() {
   return workerThreads().size();
 }
 
+void WorkerThread::PostTaskToAllWorkerThreads(
+    const WebTraceLocation& location,
+    std::unique_ptr<ExecutionContextTask> task) {
+  MutexLocker lock(threadSetMutex());
+  HashSet<WorkerThread*> threads = workerThreads();
+
+  for (WorkerThread* thread : threads) {
+    if (thread->isOwningBackingThread())
+      thread->postTask(location, std::move(task));
+  }
+}
+
 PlatformThreadId WorkerThread::platformThreadId() {
   if (!m_requestedToStart)
     return 0;