Add rendering context and rendering 2D context to OffscreenCanvas

third_party/WebKit/Source/modules/offscreencanvas/OffscreenCanvas.h

Index: third_party/WebKit/Source/modules/offscreencanvas/OffscreenCanvas.h
diff --git a/third_party/WebKit/Source/core/html/canvas/OffscreenCanvas.h b/third_party/WebKit/Source/modules/offscreencanvas/OffscreenCanvas.h
similarity index 50%
rename from third_party/WebKit/Source/core/html/canvas/OffscreenCanvas.h
rename to third_party/WebKit/Source/modules/offscreencanvas/OffscreenCanvas.h
index a9a14b258f0d9d592f2e886709f52d3fa3fca45d..abfc4194fb319505260021989cd756d7547d6d99 100644
--- a/third_party/WebKit/Source/core/html/canvas/OffscreenCanvas.h
+++ b/third_party/WebKit/Source/modules/offscreencanvas/OffscreenCanvas.h
@@ -8,29 +8,44 @@
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/ScriptWrappable.h"
-#include "core/CoreExport.h"
+#include "modules/ModulesExport.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
-class CORE_EXPORT OffscreenCanvas final : public GarbageCollectedFinalized<OffscreenCanvas>, public ScriptWrappable {
+class CanvasContextCreationAttributes;
+class OffscreenCanvasRenderingContext;
+class OffscreenCanvasRenderingContext2D;
+class OffscreenCanvasRenderingContextFactory;
+
+class MODULES_EXPORT OffscreenCanvas final : public GarbageCollectedFinalized<OffscreenCanvas>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static OffscreenCanvas* create(unsigned width, unsigned height);
+    ~OffscreenCanvas() {}
 
     IntSize size() const { return m_size; }
     unsigned width() const { return m_size.width(); }
     unsigned height() const { return m_size.height(); }
-
     void setWidth(unsigned);
     void setHeight(unsigned);
 
+    OffscreenCanvasRenderingContext2D* getContext(const String&, const CanvasContextCreationAttributes&);
+    OffscreenCanvasRenderingContext2D* renderingContext() const;
+
+    static void registerRenderingContextFactory(PassOwnPtr<OffscreenCanvasRenderingContextFactory>);
+
     DECLARE_VIRTUAL_TRACE();
 
 private:
     OffscreenCanvas(const IntSize&);
 
+    using ContextFactoryVector = Vector<OwnPtr<OffscreenCanvasRenderingContextFactory>>;
+    static ContextFactoryVector& renderingContextFactories();
+    static OffscreenCanvasRenderingContextFactory* getRenderingContextFactory(int);
+
+    Member<OffscreenCanvasRenderingContext> m_context;
     IntSize m_size;
 };