Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/html/canvas/OESTextureHalfFloat.h

Index: Source/core/html/canvas/OESTextureHalfFloat.h
diff --git a/Source/core/html/canvas/OESTextureHalfFloat.h b/Source/core/html/canvas/OESTextureHalfFloat.h
index 34bfe8a6f1d32e54adba90683c5815e47bbccab0..69d6f52c103debde2bb34f5ea4945888d13b27a7 100644
--- a/Source/core/html/canvas/OESTextureHalfFloat.h
+++ b/Source/core/html/canvas/OESTextureHalfFloat.h
@@ -34,15 +34,15 @@ namespace WebCore {
 
 class OESTextureHalfFloat : public WebGLExtension, public ScriptWrappable {
 public:
-    static PassRefPtr<OESTextureHalfFloat> create(WebGLRenderingContext*);
-    static bool supported(WebGLRenderingContext*);
+    static PassRefPtr<OESTextureHalfFloat> create(WebGLRenderingContextBase*);
+    static bool supported(WebGLRenderingContextBase*);
     static const char* getExtensionName();
 
     virtual ~OESTextureHalfFloat();
     virtual ExtensionName getName() const;
 
 private:
-    OESTextureHalfFloat(WebGLRenderingContext*);
+    OESTextureHalfFloat(WebGLRenderingContextBase*);
 };
 
 } // namespace WebCore