Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/html/canvas/EXTFragDepth.cpp

Index: Source/core/html/canvas/EXTFragDepth.cpp
diff --git a/Source/core/html/canvas/EXTFragDepth.cpp b/Source/core/html/canvas/EXTFragDepth.cpp
index 5f9e2d9e92536094b3351dd132c5e53399f4199a..0379104c4346153c7c3ff189f8822dc270100e39 100644
--- a/Source/core/html/canvas/EXTFragDepth.cpp
+++ b/Source/core/html/canvas/EXTFragDepth.cpp
@@ -31,7 +31,7 @@
 
 namespace WebCore {
 
-EXTFragDepth::EXTFragDepth(WebGLRenderingContext* context)
+EXTFragDepth::EXTFragDepth(WebGLRenderingContextBase* context)
     : WebGLExtension(context)
 {
     ScriptWrappable::init(this);
@@ -47,12 +47,12 @@ WebGLExtension::ExtensionName EXTFragDepth::getName() const
     return EXTFragDepthName;
 }
 
-PassRefPtr<EXTFragDepth> EXTFragDepth::create(WebGLRenderingContext* context)
+PassRefPtr<EXTFragDepth> EXTFragDepth::create(WebGLRenderingContextBase* context)
 {
     return adoptRef(new EXTFragDepth(context));
 }
 
-bool EXTFragDepth::supported(WebGLRenderingContext* context)
+bool EXTFragDepth::supported(WebGLRenderingContextBase* context)
 {
     Extensions3D* extensions = context->graphicsContext3D()->getExtensions();
     return extensions->supports("GL_EXT_frag_depth");