Got WebGLRenderingContextBase to work with the "implements" syntax

Source/core/html/canvas/WebGLRenderingContext.h

Index: Source/core/html/canvas/WebGLRenderingContext.h
diff --git a/Source/core/html/canvas/WebGLRenderingContext.h b/Source/core/html/canvas/WebGLRenderingContext.h
index be5de5715186d9fe3d362c49bf1c8b043ee77a6a..90eb4889ddc29ce55f6a06f39e57048d704b9bf1 100644
--- a/Source/core/html/canvas/WebGLRenderingContext.h
+++ b/Source/core/html/canvas/WebGLRenderingContext.h
@@ -26,11 +26,12 @@
 #ifndef WebGLRenderingContext_h
 #define WebGLRenderingContext_h
 
+#include "bindings/v8/ScriptWrappable.h"
 #include "core/html/canvas/WebGLRenderingContextBase.h"
 
 namespace WebCore {
 
-class WebGLRenderingContext FINAL : public WebGLRenderingContextBase {
+class WebGLRenderingContext FINAL : public ScriptWrappable, public WebGLRenderingContextBase {
 public:
     static PassOwnPtr<WebGLRenderingContext> create(HTMLCanvasElement*, WebGLContextAttributes*);
     virtual ~WebGLRenderingContext();