Bug 1193526 - Handle image.src being invalid. r=jgilbert

MozReview-Commit-ID: IhTC5kkiBu5

dom/canvas/test/webgl-conf/checkout/conformance/resources/tex-image-and-sub-image-2d-with-image.js

@@ -48,7 +48,15 @@ function generateTest(pixelFormat, pixelType, pathToTestRoot, prologue) {
 
         textureLoc = gl.getUniformLocation(program, "tex");
 
-        wtu.loadTexture(gl, pathToTestRoot + "/resources/red-green.png", runTest);
+        var image = new Image();
+        image.onload = function() {
+            runTest(image);
+        };
+        image.onerror = function() {
+            testFailed("Creating image from canvas failed. Image src: " + this.src);
+            finishTest();
+        };
+        image.src = pathToTestRoot + "/resources/red-green.png";
     }
 
     function runOneIteration(image, useTexSubImage2D, flipY, topColor, bottomColor)

dom/canvas/test/webgl-conf/checkout/conformance/resources/tex-image-and-sub-image-2d-with-svg-image.js

@@ -48,7 +48,15 @@ function generateTest(pixelFormat, pixelType, pathToTestRoot, prologue) {
 
         textureLoc = gl.getUniformLocation(program, "tex");
 
-        wtu.loadTexture(gl, pathToTestRoot + "/resources/red-green.svg", runTest);
+        var image = new Image();
+        image.onload = function() {
+            runTest(image);
+        };
+        image.onerror = function() {
+            testFailed("Creating image from canvas failed. Image src: " + this.src);
+            finishTest();
+        };
+        image.src = pathToTestRoot + "/resources/red-green.svg";
     }
 
     function runOneIteration(image, useTexSubImage2D, flipY, topColor, bottomColor)

dom/canvas/test/webgl-conf/checkout/conformance/resources/webgl-test-utils.js

@@ -1147,6 +1147,9 @@ var loadTexture = function(gl, url, callback) {
         gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
         callback(image);
     };
+    image.onerror = function() {
+      throw new Error('Failed to load image at: ' + image.src);
+    };
     image.src = url;
     return texture;
 };