servo/tests/wpt/webgl/tools/compressed-images.patch

diff --git a/tests/wpt/webgl/tests/conformance/extensions/webgl-compressed-texture-s3tc.html b/tests/wpt/webgl/tests/conformance/extensions/webgl-compressed-texture-s3tc.html
index 308e8577a8..ea56180224 100644
--- a/tests/wpt/webgl/tests/conformance/extensions/webgl-compressed-texture-s3tc.html
+++ b/tests/wpt/webgl/tests/conformance/extensions/webgl-compressed-texture-s3tc.html
@@ -695,13 +695,6 @@ function compareRect(width, height, channels, expectedData, filteringMode) {
     gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, actual);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "reading back pixels");
 
-    var div = document.createElement("div");
-    div.className = "testimages";
-    insertImg(div, "expected", makeImage(width, height, expectedData, channels == 4));
-    insertImg(div, "actual", makeImage(width, height, actual, channels == 4));
-    div.appendChild(document.createElement('br'));
-    document.getElementById("console").appendChild(div);
-
     var failed = false;
     for (var yy = 0; yy < height; ++yy) {
         for (var xx = 0; xx < width; ++xx) {
@@ -715,6 +708,13 @@ function compareRect(width, height, channels, expectedData, filteringMode) {
             for (var jj = 0; jj < 4; ++jj) {
                 if (actual[offset + jj] != expected[jj]) {
                     failed = true;
+                    var div = document.createElement("div");
+                    div.className = "testimages";
+                    insertImg(div, "expected", makeImage(width, height, expectedData, channels == 4));
+                    insertImg(div, "actual", makeImage(width, height, actual, channels == 4));
+                    div.appendChild(document.createElement('br'));
+                    document.getElementById("console").appendChild(div);
+
                     var was = actual[offset + 0].toString();
                     for (var j = 1; j < 4; ++j) {
                         was += "," + actual[offset + j];