Make WebGL objects scriptwrappable so that binding integrity checks may be applied to them.

Source/core/html/canvas/WebGLContextAttributes.cpp

Index: Source/core/html/canvas/WebGLContextAttributes.cpp
diff --git a/Source/core/html/canvas/WebGLContextAttributes.cpp b/Source/core/html/canvas/WebGLContextAttributes.cpp
index 374828e23ee1bafb3cb6e75b1f4bd1634c398ccc..a28e4cf20c25429ca6b5f8a0c0c02627405a96c3 100644
--- a/Source/core/html/canvas/WebGLContextAttributes.cpp
+++ b/Source/core/html/canvas/WebGLContextAttributes.cpp
@@ -43,12 +43,14 @@ PassRefPtr<WebGLContextAttributes> WebGLContextAttributes::create(GraphicsContex
 WebGLContextAttributes::WebGLContextAttributes()
     : CanvasContextAttributes()
 {
+    ScriptWrappable::init(this);
 }
 
 WebGLContextAttributes::WebGLContextAttributes(GraphicsContext3D::Attributes attributes)
     : CanvasContextAttributes()
     , m_attrs(attributes)
 {
+    ScriptWrappable::init(this);
 }
 
 WebGLContextAttributes::~WebGLContextAttributes()