Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/html/canvas/WebGLDrawBuffers.h

Index: Source/core/html/canvas/WebGLDrawBuffers.h
diff --git a/Source/core/html/canvas/WebGLDrawBuffers.h b/Source/core/html/canvas/WebGLDrawBuffers.h
index b002f221e2303914d5b79041143ae4166de01111..17393142f5579f627084e8ccc0d33ab064b1d3cb 100644
--- a/Source/core/html/canvas/WebGLDrawBuffers.h
+++ b/Source/core/html/canvas/WebGLDrawBuffers.h
@@ -34,8 +34,8 @@ namespace WebCore {
 
 class WebGLDrawBuffers : public WebGLExtension, public ScriptWrappable {
 public:
-    static PassRefPtr<WebGLDrawBuffers> create(WebGLRenderingContext*);
-    static bool supported(WebGLRenderingContext*);
+    static PassRefPtr<WebGLDrawBuffers> create(WebGLRenderingContextBase*);
+    static bool supported(WebGLRenderingContextBase*);
     static const char* getExtensionName();
 
     virtual ~WebGLDrawBuffers();
@@ -44,9 +44,9 @@ public:
     void drawBuffersWEBGL(const Vector<GC3Denum>& buffers);
 
 private:
-    WebGLDrawBuffers(WebGLRenderingContext*);
+    WebGLDrawBuffers(WebGLRenderingContextBase*);
 
-    static bool satisfiesWebGLRequirements(WebGLRenderingContext*);
+    static bool satisfiesWebGLRequirements(WebGLRenderingContextBase*);
 };
 
 } // namespace WebCore