Import wpt@ed94c51f3dfaa5ff4c9c311add1a560408059c51

third_party/WebKit/LayoutTests/imported/wpt/common/vendor-prefix.js

Index: third_party/WebKit/LayoutTests/imported/wpt/common/vendor-prefix.js
diff --git a/third_party/WebKit/LayoutTests/resources/vendor-prefix.js b/third_party/WebKit/LayoutTests/imported/wpt/common/vendor-prefix.js
similarity index 56%
copy from third_party/WebKit/LayoutTests/resources/vendor-prefix.js
copy to third_party/WebKit/LayoutTests/imported/wpt/common/vendor-prefix.js
index 0365f2ea9fde5efb8c16e3be8355fae41ad1720e..1a91632cec2860f120c806ef0516e5ddcd01077c 100644
--- a/third_party/WebKit/LayoutTests/resources/vendor-prefix.js
+++ b/third_party/WebKit/LayoutTests/imported/wpt/common/vendor-prefix.js
@@ -1,17 +1,3 @@
-/*
- * Distributed under both the W3C Test Suite License [1] and the W3C
- * 3-clause BSD License [2]. To contribute to a W3C Test Suite, see the
- * policies and contribution forms [3].
- *
- * [1] http://www.w3.org/Consortium/Legal/2008/04-testsuite-license
- * [2] http://www.w3.org/Consortium/Legal/2008/03-bsd-license
- * [3] http://www.w3.org/2004/10/27-testcases
- * */
-
-/* Source: https://github.com/w3c/web-platform-tests/blob/master/common/vendor-prefix.js
- * The file has been modified to always be on (i.e. does not require usePrefixes=1 to
- * start replacing prefixes).  */
-
 /* Use this script when you want to test APIs that use vendor prefixes
    and define which objects need to be checked for prefixed versions, à la
    <script src="vendor-prefix.js"
@@ -78,23 +64,52 @@
         }
     }
 
-    // For this version of vendor-prefixes.js, always replace the prefixes.
-    if (document.querySelector("script[data-prefixed-objects]")) {
-        var prefixObjectsData = document.querySelector("script[data-prefixed-objects]").dataset["prefixedObjects"];
-        try {
-            var prefixedObjects = JSON.parse(prefixObjectsData);
-        } catch (e) {
-            throw "couldn't parse data-prefixed-objects as JSON:" + e;
+    if (location.search.indexOf('usePrefixes=1') !== -1) {
+        if (document.querySelector("script[data-prefixed-objects]")) {
+            var prefixObjectsData = document.querySelector("script[data-prefixed-objects]").dataset["prefixedObjects"];
+            try {
+                var prefixedObjects = JSON.parse(prefixObjectsData);
+            } catch (e) {
+                throw "couldn't parse data-prefixed-objects as JSON:" + e;
+            }
+            prefixedObjects.forEach(setAlias);
         }
-        prefixedObjects.forEach(setAlias);
-    }
-    if (document.querySelector("script[data-prefixed-prototypes]")) {
-        var prefixProtoData = document.querySelector("script[data-prefixed-prototypes]").dataset["prefixedPrototypes"];
-        try {
-            var prefixedPrototypes = JSON.parse(prefixProtoData);
-        } catch (e) {
-            throw "couldn't parse data-prefixed-prototypes as JSON:" + e;
+        if (document.querySelector("script[data-prefixed-prototypes]")) {
+            var prefixProtoData = document.querySelector("script[data-prefixed-prototypes]").dataset["prefixedPrototypes"];
+            try {
+                var prefixedPrototypes = JSON.parse(prefixProtoData);
+            } catch (e) {
+                throw "couldn't parse data-prefixed-prototypes as JSON:" + e;
+            }
+            prefixedPrototypes.forEach(setPrototypeAlias);
         }
-        prefixedPrototypes.forEach(setPrototypeAlias);
+        var ul = document.createElement("ul");
+        Object.keys(aliases).forEach(function (alias) {
+            var li = document.createElement("li");
+            li.appendChild(document.createTextNode(alias + " has been set to be an alias of vendor-prefixed " + aliases[alias]));
+            ul.appendChild(li);
+        });
+        documentingPrefixUsage.appendChild(ul);
+    } else {
+        // Document that the test can be run with prefixes enabled
+
+        var a = document.createElement('a');
+        var link = "";
+        if (location.search) {
+            link = location.search + "&usePrefixes=1";
+        } else {
+            link = "?usePrefixes=1";
+        }
+        a.setAttribute("href", link);
+        a.appendChild(document.createTextNode("with vendor prefixes enabled"));
+        documentingPrefixUsage.appendChild(document.createTextNode("The feature(s) tested here are known to have been made available via vendor prefixes; you can run this test "));
+        documentingPrefixUsage.appendChild(a);
+        documentingPrefixUsage.appendChild(document.createTextNode("."));
+    }
+    var log = document.getElementById('log');
+    if (log) {
+        log.parentNode.insertBefore(documentingPrefixUsage, log);
+    } else {
+        document.body.appendChild(documentingPrefixUsage);
     }
 })();