Add WorkerSettings to expose certain flag values in WorkerGlobalScope

third_party/WebKit/Source/core/workers/WorkerSettings.h

+// 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 WorkerSettings_h
+#define WorkerSettings_h
+
+#include "core/CoreExport.h"
+#include "core/frame/Settings.h"
+
+namespace blink {
+
+class CORE_EXPORT WorkerSettings {
+public:
+    WorkerSettings(Settings*);
+    virtual ~WorkerSettings() {}
+
+    bool disableReadingFromCanvas() const { return m_disableReadingFromCanvas; }
+
+private:
+    void copyFlagValuesFromSettings(Settings*);
+    void setDefaultValues();
+
+    // The settings that are to be copied from main thread to worker thread
+    // These setting's flag values must remain unchanged throughout the document
+    // lifecycle.
+    // We hard-code the flags as there're very few flags at this moment.
+    bool m_disableReadingFromCanvas;
+};
+
+} // namespace blink
+
+#endif // WorkerSettings_h