Improve samplerParameter[if] in WebGL2

Source/modules/webgl/WebGL2RenderingContextBase.h

Index: Source/modules/webgl/WebGL2RenderingContextBase.h
diff --git a/Source/modules/webgl/WebGL2RenderingContextBase.h b/Source/modules/webgl/WebGL2RenderingContextBase.h
index 3922021b672bc23aae7d112b6b32b4b484e0724f..19fa2d71ac579f0964b13dacd1b894a9edc1c7ab 100644
--- a/Source/modules/webgl/WebGL2RenderingContextBase.h
+++ b/Source/modules/webgl/WebGL2RenderingContextBase.h
@@ -189,6 +189,7 @@ protected:
     ScriptValue getInt64Parameter(ScriptState*, GLenum);
 
     void texSubImage3DImpl(GLenum, GLint, GLint, GLint, GLint, GLenum, GLenum, Image*, WebGLImageConversion::ImageHtmlDomSource, bool, bool);
+    void samplerParameter(WebGLSampler*, GLenum, GLfloat, GLint, bool);
 
     /* WebGLRenderingContextBase overrides */
     unsigned getMaxWebGLLocationLength() const override { return 1024; };