Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/html/canvas/WebGLDrawBuffers.h

Index: Source/core/html/canvas/WebGLDrawBuffers.h
diff --git a/Source/core/html/canvas/WebGLDrawBuffers.h b/Source/core/html/canvas/WebGLDrawBuffers.h
index 7b8c0440afd5bb9e054117c920976e2f62f109ee..be66f91c99d5127d7eb0b20dbfdff41369aec86a 100644
--- a/Source/core/html/canvas/WebGLDrawBuffers.h
+++ b/Source/core/html/canvas/WebGLDrawBuffers.h
@@ -34,19 +34,19 @@ namespace WebCore {
 
 class WebGLDrawBuffers FINAL : public WebGLExtension, public ScriptWrappable {
 public:
-    static PassRefPtr<WebGLDrawBuffers> create(WebGLRenderingContext*);
-    static bool supported(WebGLRenderingContext*);
+    static PassRefPtr<WebGLDrawBuffers> create(WebGLRenderingContextBase*);
+    static bool supported(WebGLRenderingContextBase*);
     static const char* extensionName();
 
     virtual ~WebGLDrawBuffers();
-    virtual ExtensionName name() const OVERRIDE;
+    virtual WebGLExtensionName name() const OVERRIDE;
 
     void drawBuffersWEBGL(const Vector<GLenum>& buffers);
 
 private:
-    WebGLDrawBuffers(WebGLRenderingContext*);
+    WebGLDrawBuffers(WebGLRenderingContextBase*);
 
-    static bool satisfiesWebGLRequirements(WebGLRenderingContext*);
+    static bool satisfiesWebGLRequirements(WebGLRenderingContextBase*);
 };
 
 } // namespace WebCore