Re-enable advanced blend with a blacklist

src/gpu/gl/GrGLCaps.h

Index: src/gpu/gl/GrGLCaps.h
diff --git a/src/gpu/gl/GrGLCaps.h b/src/gpu/gl/GrGLCaps.h
index e924c60efb945796be098d138ec8fcede51b897c..fef7d698e7ffbe4af46fca9ea433b622a2846d6a 100644
--- a/src/gpu/gl/GrGLCaps.h
+++ b/src/gpu/gl/GrGLCaps.h
@@ -304,6 +304,7 @@ private:
     };
 
     void initFSAASupport(const GrGLContextInfo&, const GrGLInterface*);
+    void initBlendEqationSupport(const GrGLContextInfo&);
     void initStencilFormats(const GrGLContextInfo&);
     // This must be called after initFSAASupport().
     void initConfigRenderableTable(const GrGLContextInfo&);