Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/html/canvas/WebGLExtensionNames.h

 /*
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  * modification, are permitted provided that the following conditions
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-#ifndef WebGLCompressedTexturePVRTC_h
-#define WebGLCompressedTexturePVRTC_h
-
-#include "bindings/v8/ScriptWrappable.h"
-#include "core/html/canvas/WebGLExtension.h"
-#include "wtf/PassRefPtr.h"
+#ifndef WebGLExtensionNames_h
+#define WebGLExtensionNames_h
 
 namespace WebCore {
 
-class WebGLCompressedTexturePVRTC : public WebGLExtension, public ScriptWrappable {
-public:
-    static PassRefPtr<WebGLCompressedTexturePVRTC> create(WebGLRenderingContext*);
-    static bool supported(WebGLRenderingContext*);
-    static const char* getExtensionName();
-
-    virtual ~WebGLCompressedTexturePVRTC();
-    virtual ExtensionName getName() const;
-
-private:
-    WebGLCompressedTexturePVRTC(WebGLRenderingContext*);
+// Extension names are needed to properly wrap instances in JavaScript objects.
+enum WebGLExtensionName {

[bajones, 2013/09/24 00:12:01]

These used to live under WebGLExtension, moved out to avoid circular dependency
when included by WebGLRenderingContextBase

+    ANGLEInstancedArraysName,
+    EXTFragDepthName,
+    EXTTextureFilterAnisotropicName,
+    OESElementIndexUintName,
+    OESStandardDerivativesName,
+    OESTextureFloatLinearName,
+    OESTextureFloatName,
+    OESTextureHalfFloatLinearName,
+    OESTextureHalfFloatName,
+    OESVertexArrayObjectName,
+    WebGLCompressedTextureATCName,
+    WebGLCompressedTexturePVRTCName,
+    WebGLCompressedTextureS3TCName,
+    WebGLDebugRendererInfoName,
+    WebGLDebugShadersName,
+    WebGLDepthTextureName,
+    WebGLDrawBuffersName,
+    WebGLLoseContextName,
+    WebGLExtensionNameCount, // Must be the last entry

[bajones, 2013/09/24 00:12:01]

Allows the array of "extensionEnabled" bools in the context to be statically
allocated. I'm assuming that we should never have name conflicts between a WebGL
extension and a WebGL2 extension.

 };
 
 } // namespace WebCore
 
-#endif // WebGLCompressedTexturePVRTC_h
+#endif // WebGLExtensionNames_h