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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/sampler-struct-function-arg.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/sampler-struct-function-arg.html
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/sampler-struct-function-arg.html
@@ -0,0 +1,113 @@
+<!--
+Copyright (c) 2019 The Khronos Group Inc.
+Use of this source code is governed by an MIT-style license that can be
+found in the LICENSE.txt file.
+-->
+
+
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Passing a struct containing a sampler to a function.</title>
+<link rel="stylesheet" href="../../../resources/js-test-style.css"/>
+<script src="../../../js/js-test-pre.js"></script>
+<script src="../../../js/webgl-test-utils.js"></script>
+</head>
+
+<body>
+<canvas id="output" style="border: none;" width="64" height="64"></canvas>
+<div id="description"></div>
+<div id="console"></div>
+
+<script id="shader-fs" type="x-shader/x-fragment">
+    precision mediump float;
+
+    struct SomeStruct{
+        sampler2D source;
+    };
+
+    vec4 fun(SomeStruct s){
+        return texture2D(s.source, vec2(0.5));
+    }
+
+    uniform SomeStruct green;
+    void main(){
+        gl_FragColor = fun(green);
+    }
+</script>
+
+<script id="shader-fs-array" type="x-shader/x-fragment">
+    precision mediump float;
+
+    struct SomeStruct{
+        sampler2D source;
+    };
+
+    vec4 fun(SomeStruct s[2]){
+        return texture2D(s[0].source, vec2(0.5));
+    }
+
+    uniform SomeStruct green[2];
+    void main(){
+        gl_FragColor = fun(green);
+    }
+</script>
+
+<script>
+"use strict";
+
+description();
+debug("If the test passes correctly the viewport will be green.");
+
+var wtu = WebGLTestUtils;
+var canvas = document.getElementById("output");
+var gl = wtu.create3DContext(canvas);
+
+var textureGreen;
+
+var createGreenTexture = function() {
+    var texture = gl.createTexture();
+    gl.bindTexture(gl.TEXTURE_2D, texture);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
+    wtu.fillTexture(gl, texture, 1, 1, [0, 255, 0, 255]);
+    gl.bindTexture(gl.TEXTURE_2D, null);
+    return texture;
+};
+
+var test = function(fragShaderId, texUniformName) {
+    var program = wtu.setupProgram(gl, [wtu.simpleVertexShader, fragShaderId], ["a_position"], [0], true);
+
+    if (!program) {
+        testFailed("Shader compilation/link failed");
+    } else {
+        // Bind texture
+        var uniformMap = wtu.getUniformMap(gl, program);
+        gl.activeTexture(gl.TEXTURE0);
+        gl.bindTexture(gl.TEXTURE_2D, textureGreen);
+        gl.uniform1i(uniformMap[texUniformName].location, 0);
+
+        // Draw
+        wtu.clearAndDrawUnitQuad(gl);
+
+        // Verify output
+        wtu.checkCanvasRect(gl, 0, 128, 256, 128, [0, 255,0, 255], "should be green",  1);
+    }
+};
+
+if (!gl) {
+    testFailed("context does not exist");
+} else {
+    wtu.setupUnitQuad(gl, 0, 1);
+    textureGreen = createGreenTexture();
+    test("shader-fs", "green.source");
+    test("shader-fs-array", "green[0].source");
+}
+var successfullyParsed = true;
+</script>
+<script src="../../../js/js-test-post.js"></script>
+</body>
+</html>