Add rendering context and rendering 2D context to OffscreenCanvas

third_party/WebKit/Source/modules/offscreencanvas/OffscreenCanvasRenderingContext.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 InputEvent_h
-#define InputEvent_h
+#ifndef OffscreenCanvasRenderingContext_h
+#define OffscreenCanvasRenderingContext_h
 
-#include "core/events/InputEventInit.h"
-#include "core/events/UIEvent.h"
+#include "modules/ModulesExport.h"
+#include "modules/offscreencanvas/OffscreenCanvas.h"
 
 namespace blink {
 
-class InputEvent final : public UIEvent {
-    DEFINE_WRAPPERTYPEINFO();
+class MODULES_EXPORT OffscreenCanvasRenderingContext : public GarbageCollectedFinalized<OffscreenCanvasRenderingContext>, public ScriptWrappable {
+    WTF_MAKE_NONCOPYABLE(OffscreenCanvasRenderingContext);
+public:
+    virtual ~OffscreenCanvasRenderingContext() { }
+    enum ContextType {
+        Context2d = 0,
+        ContextWebgl = 1,
+        ContextWebgl2 = 2,
+        ContextTypeCount
+    };
+    static ContextType contextTypeFromId(const String& id);
 
-public:
-    static PassRefPtrWillBeRawPtr<InputEvent> create()
-    {
-        return adoptRefWillBeNoop(new InputEvent);
-    }
+    OffscreenCanvas* offscreenCanvas() const { return m_offscreenCanvas; }
+    virtual ContextType contextType() const = 0;
 
-    static PassRefPtrWillBeRawPtr<InputEvent> create(const AtomicString& type, const InputEventInit& initializer)
-    {
-        return adoptRefWillBeNoop(new InputEvent(type, initializer));
-    }
+    virtual bool is2d() const { return false; }
 
-    bool isInputEvent() const override;
-
+protected:
+    OffscreenCanvasRenderingContext(OffscreenCanvas*);
     DECLARE_VIRTUAL_TRACE();
 
 private:
-    InputEvent();
-    InputEvent(const AtomicString&, const InputEventInit&);
+    Member<OffscreenCanvas> m_offscreenCanvas;
 };
 
-DEFINE_EVENT_TYPE_CASTS(InputEvent);
-
 } // namespace blink
 
-#endif // InputEvent_h
+#endif // OffscreenCanvasRenderingContext_h