Merge the Sky Engine changes from the SkyDart branch

sky/engine/core/html/canvas/EXTBlendMinMax.h

 // Copyright 2014 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 SKY_ENGINE_CORE_HTML_CANVAS_EXTBLENDMINMAX_H_
 #define SKY_ENGINE_CORE_HTML_CANVAS_EXTBLENDMINMAX_H_
 
-#include "sky/engine/bindings/core/v8/ScriptWrappable.h"
+#include "sky/engine/tonic/dart_wrappable.h"
 #include "sky/engine/core/html/canvas/WebGLExtension.h"
 #include "sky/engine/wtf/PassRefPtr.h"
 
 namespace blink {
 
-class EXTBlendMinMax final : public WebGLExtension, public ScriptWrappable {
+class EXTBlendMinMax final : public WebGLExtension, public DartWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtr<EXTBlendMinMax> create(WebGLRenderingContextBase*);
     static bool supported(WebGLRenderingContextBase*);
     static const char* extensionName();
 
     virtual ~EXTBlendMinMax();
     virtual WebGLExtensionName name() const override;
 
 private:
     explicit EXTBlendMinMax(WebGLRenderingContextBase*);
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_HTML_CANVAS_EXTBLENDMINMAX_H_