HTMLCanvasElement.toDataURL should use IDL 'any' to avoid using custom binding.

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 467 matching lines @@
         RefPtrWillBeRawPtr<ImageData> imageData =
             toWebGLRenderingContext(m_context.get())->paintRenderingResultsToImageData(sourceBuffer);
         if (imageData)
             return ImageDataBuffer(imageData->size(), imageData->data()->data()).toDataURL(encodingMimeType, quality);
         m_context->paintRenderingResultsToCanvas(sourceBuffer);
     }
 
     return buffer()->toDataURL(encodingMimeType, quality);
 }
 
-String HTMLCanvasElement::toDataURL(const String& mimeType, const double* quality, ExceptionState& exceptionState) const
+String HTMLCanvasElement::toDataURL(const String& mimeType, const ScriptValue& qualityArgument, ExceptionState& exceptionState) const
 {
     if (!originClean()) {
         exceptionState.throwSecurityError("Tainted canvases may not be exported.");
         return String();
     }
-
-    return toDataURLInternal(mimeType, quality, BackBuffer);
+    double quality;
+    double* qualityPtr = nullptr;
+    if (!qualityArgument.isEmpty()) {
+        v8::Local<v8::Value> v8Value = qualityArgument.v8Value();
+        if (v8Value->IsNumber()) {
+            quality = v8Value->NumberValue();
+            qualityPtr = &quality;
+        }
+    }
+    return toDataURLInternal(mimeType, qualityPtr, BackBuffer);
 }
 
 SecurityOrigin* HTMLCanvasElement::securityOrigin() const
 {
     return document().securityOrigin();
 }
 
 bool HTMLCanvasElement::originClean() const
 {
     if (document().settings() && document().settings()->disableReadingFromCanvas())
@@ skipping 379 matching lines @@
 {
     return FloatSize(width(), height());
 }
 
 bool HTMLCanvasElement::isOpaque() const
 {
     return m_context && !m_context->hasAlpha();
 }
 
 } // blink