Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/html/canvas/WebGLCompressedTextureATC.h

Index: Source/core/html/canvas/WebGLCompressedTextureATC.h
diff --git a/Source/core/html/canvas/WebGLCompressedTextureATC.h b/Source/core/html/canvas/WebGLCompressedTextureATC.h
index 4984696ed670d71998024f6541628afad38e7821..b7aa2958b35a04586a03cb359698278fc05409b1 100644
--- a/Source/core/html/canvas/WebGLCompressedTextureATC.h
+++ b/Source/core/html/canvas/WebGLCompressedTextureATC.h
@@ -36,15 +36,15 @@ class WebGLTexture;
 
 class WebGLCompressedTextureATC : public WebGLExtension, public ScriptWrappable {
 public:
-    static PassRefPtr<WebGLCompressedTextureATC> create(WebGLRenderingContext*);
-    static bool supported(WebGLRenderingContext*);
+    static PassRefPtr<WebGLCompressedTextureATC> create(WebGLRenderingContextBase*);
+    static bool supported(WebGLRenderingContextBase*);
     static const char* getExtensionName();
 
     virtual ~WebGLCompressedTextureATC();
     virtual ExtensionName getName() const;
 
 private:
-    WebGLCompressedTextureATC(WebGLRenderingContext*);
+    WebGLCompressedTextureATC(WebGLRenderingContextBase*);
 };
 
 } // namespace WebCore