Pass per-frame task runners to Workers (when possible)

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

Index: third_party/WebKit/Source/core/workers/ParentFrameTaskRunners.cpp
diff --git a/third_party/WebKit/Source/core/workers/ParentFrameTaskRunners.cpp b/third_party/WebKit/Source/core/workers/ParentFrameTaskRunners.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..10350aefdf6df7a88054a37bd940b4915819b2b3
--- /dev/null
+++ b/third_party/WebKit/Source/core/workers/ParentFrameTaskRunners.cpp
@@ -0,0 +1,40 @@
+// 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.
+
+#include "core/workers/ParentFrameTaskRunners.h"
+
+#include "core/dom/Document.h"
+#include "core/dom/TaskRunnerHelper.h"
+#include "wtf/Assertions.h"
+
+namespace blink {
+
+ParentFrameTaskRunners::~ParentFrameTaskRunners()
+{
+}
+
+WebTaskRunner* ParentFrameTaskRunners::getUnthrottledTaskRunner()
+{
+    return m_unthrottledTaskRunner.get();
+}
+
+WebTaskRunner* ParentFrameTaskRunners::getTimerTaskRunner()
+{
+    return m_timerTaskRunner.get();
+}
+
+WebTaskRunner* ParentFrameTaskRunners::getLoadingTaskRunner()
+{
+    return m_loadingTaskRunner.get();
+}
+
+ParentFrameTaskRunners::ParentFrameTaskRunners(Document* document)
+    : m_unthrottledTaskRunner(TaskRunnerHelper::getUnthrottledTaskRunner(document)->clone())
+    , m_timerTaskRunner(TaskRunnerHelper::getTimerTaskRunner(document)->clone())
+    , m_loadingTaskRunner(TaskRunnerHelper::getLoadingTaskRunner(document)->clone())
+{
+    DCHECK(document->isContextThread());
+}
+
+} // namespace blink