Implement OffscreenCanvas.getContext('webgl')

third_party/WebKit/Source/modules/offscreencanvas/OffscreenCanvasModules.cpp

Index: third_party/WebKit/Source/modules/offscreencanvas/OffscreenCanvasModules.cpp
diff --git a/third_party/WebKit/Source/modules/offscreencanvas/OffscreenCanvasModules.cpp b/third_party/WebKit/Source/modules/offscreencanvas/OffscreenCanvasModules.cpp
index 2979dcbabdb74c80e0c7286a410af02a12fa8a23..3e96051d523af6807b4d4d26114cb5ba16d30d52 100644
--- a/third_party/WebKit/Source/modules/offscreencanvas/OffscreenCanvasModules.cpp
+++ b/third_party/WebKit/Source/modules/offscreencanvas/OffscreenCanvasModules.cpp
@@ -10,13 +10,11 @@
 
 namespace blink {
 
-OffscreenCanvasRenderingContext2D* OffscreenCanvasModules::getContext(OffscreenCanvas& offscreenCanvas, const String& id, const CanvasContextCreationAttributes& attributes)
+void OffscreenCanvasModules::getContext(ScriptState* scriptState, OffscreenCanvas& offscreenCanvas, const String& id, const CanvasContextCreationAttributes& attributes, OffscreenRenderingContext& result)
 {
-    CanvasRenderingContext* context = offscreenCanvas.getCanvasRenderingContext(id, attributes);
-    if (!context)
-        return nullptr;
-
-    return static_cast<OffscreenCanvasRenderingContext2D*>(context);
+    CanvasRenderingContext* context = offscreenCanvas.getCanvasRenderingContext(scriptState, id, attributes);
+    if (context)
+        context->setOffscreenCanvasGetContextResult(result);
 }
 
 } // namespace blink