Use a union typdef for the return type of canvas.getContext

third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 190 matching lines @@
 }
 
 void HTMLCanvasElement::registerRenderingContextFactory(PassOwnPtr<CanvasRenderingContextFactory> renderingContextFactory)
 {
     CanvasRenderingContext::ContextType type = renderingContextFactory->getContextType();
     ASSERT(type < CanvasRenderingContext::ContextTypeCount);
     ASSERT(!renderingContextFactories()[type]);
     renderingContextFactories()[type] = renderingContextFactory;
 }
 
-ScriptValue HTMLCanvasElement::getContext(ScriptState* scriptState, const String& type, const CanvasContextCreationAttributes& attributes)
-{
-    CanvasRenderingContext* context = getCanvasRenderingContext(type, attributes);
-    if (!context) {
-        return ScriptValue::createNull(scriptState);
-    }
-    return ScriptValue(scriptState, toV8(context, scriptState->context()->Global(), scriptState->isolate()));
-}
-
 CanvasRenderingContext* HTMLCanvasElement::getCanvasRenderingContext(const String& type, const CanvasContextCreationAttributes& attributes)
 {
     CanvasRenderingContext::ContextType contextType = CanvasRenderingContext::contextTypeFromId(type);
 
     // Unknown type.
     if (contextType == CanvasRenderingContext::ContextTypeCount)
         return nullptr;
 
     // Log the aliased context type used.
     if (!m_context) {
@@ skipping 852 matching lines @@
         || element.hasTagName(HTMLNames::tfootTag)
         || element.hasTagName(HTMLNames::trTag)
         || element.hasTagName(HTMLNames::tdTag)
         || element.hasTagName(HTMLNames::thTag))
         return true;
 
     return false;
 }
 
 } // namespace blink