Add helper functions to get per-frame task runners

third_party/WebKit/Source/core/dom/TaskRunnerHelper.h

Index: third_party/WebKit/Source/core/dom/TaskRunnerHelper.h
diff --git a/third_party/WebKit/Source/core/dom/TaskRunnerHelper.h b/third_party/WebKit/Source/core/dom/TaskRunnerHelper.h
new file mode 100644
index 0000000000000000000000000000000000000000..d3a5b19f21124188145988dc08c682a48977e07d
--- /dev/null
+++ b/third_party/WebKit/Source/core/dom/TaskRunnerHelper.h
@@ -0,0 +1,29 @@
+// Copyright 2016 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.
+
+#ifndef TaskRunnerHelper_h
+#define TaskRunnerHelper_h
+
+#include "wtf/Allocator.h"
+
+namespace blink {
+
+class Document;
+class LocalFrame;
+class WebTaskRunner;
+
+class TaskRunnerHelper final {
+    STATIC_ONLY(TaskRunnerHelper);
+public:
+    static WebTaskRunner* getUnthrottledTaskRunner(LocalFrame*);
+    static WebTaskRunner* getTimerTaskRunner(LocalFrame*);
+    static WebTaskRunner* getLoadingTaskRunner(LocalFrame*);
+    static WebTaskRunner* getUnthrottledTaskRunner(Document*);
+    static WebTaskRunner* getTimerTaskRunner(Document*);
+    static WebTaskRunner* getLoadingTaskRunner(Document*);
+};
+
+} // namespace blink
+
+#endif