Issue 3459 - Added content policy tests for <picture>

chrome/content/tests/policy.js

 (function()
 {
   let server = null;
   let frame = null;
   let requestNotifier = null;
   let httpProtocol = null;
 
   module("Content policy", {
     setup: function()
     {
@@ skipping 82 matching lines @@
       "HTML image button inside a nested frame",
       '<iframe src="data:text/html,%3Ciframe%20src%3D%22data%3Atext%2Fhtml%2C%253Cinput%2520type%253D%2522image%2522%2520src%253D%2522http%253A%252F%252F127.0.0.1%3A1234%252Ftest.gif%2522%253E%22%3E%3C%2Fiframe%3E"></iframe>',
       "http://127.0.0.1:1234/test.gif", "image", false, false
     ],
     [
       "HTML image with srcset",
       '<img srcset="test.gif">',
       "http://127.0.0.1:1234/test.gif", "image", false, false
     ],
     [
+      "HTML picture",
+      '<picture>' +
+        '<source srcset="test.gif">' +
+        '<img>' +
+      '</picture>',
+      "http://127.0.0.1:1234/test.gif", "image", false, false
+    ],
+    [
       "Dynamically inserted image button",
       '<div id="insert"></div>' +
       '<script>' +
         'window.addEventListener("DOMContentLoaded", function()' +
         '{' +
           'var div = document.getElementById("insert");' +
           'div.innerHTML = \'<input type="image" id="image" src="test.gif">\';' +
           'var image = document.getElementById("image");' +
           'image.onload = image.onerror = function ()' +
           '{' +
@@ skipping 356 matching lines @@
     for (let stage = 1; stage in stageDescriptions; stage++)
     {
       let stageDescription = stageDescriptions[stage];
       if (stageDescription.indexOf("%S") >= 0)
         stageDescription = stageDescription.replace("%S", expectedURL);
 
       asyncTest(name + " (" + stageDescription + ")", runTest.bind(null, tests[test], stage));
     }
   }
 })();