Add support for Low Priorirty tasks.

Source/platform/exported/WebSchedulerProxy.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 
 #include "public/platform/WebSchedulerProxy.h"
 
 #include "platform/TraceLocation.h"
 #include "platform/scheduler/Scheduler.h"
@@ skipping 31 matching lines @@
     TraceLocation location(webLocation.functionName(), webLocation.fileName());
     m_scheduler->postInputTask(location, bind(&runTask, adoptPtr(task)));
 }
 
 void WebSchedulerProxy::postCompositorTask(const WebTraceLocation& webLocation, WebThread::Task* task)
 {
     TraceLocation location(webLocation.functionName(), webLocation.fileName());
     m_scheduler->postCompositorTask(location, bind(&runTask, adoptPtr(task)));
 }
 
+void WebSchedulerProxy::postIpcTask(const WebTraceLocation& webLocation, WebThread::Task* task)
+{
+    TraceLocation location(webLocation.functionName(), webLocation.fileName());
+    m_scheduler->postIpcTask(location, bind(&runTask, adoptPtr(task)));
+}
+
 } // namespace blink