Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/html/canvas/WebGLSharedObject.h

Index: Source/core/html/canvas/WebGLSharedObject.h
diff --git a/Source/core/html/canvas/WebGLSharedObject.h b/Source/core/html/canvas/WebGLSharedObject.h
index 6c33471ba7fb52b7235e0e8da1211dc32a586337..12e10874859945be63cb40ddf68f7106502e3712 100644
--- a/Source/core/html/canvas/WebGLSharedObject.h
+++ b/Source/core/html/canvas/WebGLSharedObject.h
@@ -32,7 +32,7 @@ namespace WebCore {
 
 class GraphicsContext3D;
 class WebGLContextGroup;
-class WebGLRenderingContext;
+class WebGLRenderingContextBase;
 
 // WebGLSharedObject the base class for objects that can be shared by multiple
 // WebGLRenderingContexts.
@@ -49,7 +49,7 @@ public:
     virtual bool isShader() const { return false; }
     virtual bool isTexture() const { return false; }
 
-    virtual bool validate(const WebGLContextGroup* contextGroup, const WebGLRenderingContext*) const
+    virtual bool validate(const WebGLContextGroup* contextGroup, const WebGLRenderingContextBase*) const
     {
         return contextGroup == m_contextGroup;
     }
@@ -57,7 +57,7 @@ public:
     void detachContextGroup();
 
 protected:
-    WebGLSharedObject(WebGLRenderingContext*);
+    WebGLSharedObject(WebGLRenderingContextBase*);
 
     virtual bool hasGroupOrContext() const
     {