Add W3C encrypted-media tests

third_party/WebKit/LayoutTests/imported/wpt/encrypted-media/scripts/unique-origin.js

+function runTest(config) {
+    // When the sandbox attribute is present on an iframe, it will
+    // treat the content as being from a unique origin. So try to
+    // call createMediaKeys() inside an iframe and it should fail.
+
+    function load_iframe(src, sandbox) {
+        return new Promise(function (resolve) {
+            var iframe = document.createElement('iframe');
+            iframe.onload = function () {
+                resolve(iframe);
+            };
+            iframe.sandbox = sandbox;
+            iframe.src = src;
+            document.documentElement.appendChild(iframe);
+        });
+    }
+
+    function wait_for_message() {
+        return new Promise(function (resolve) {
+            self.addEventListener('message', function listener(e) {
+                resolve(e.data);
+                self.removeEventListener('message', listener);
+            });
+        });
+    }
+
+    promise_test(function (test) {
+        var script = 'data:text/html,' +
+          '<script>' +
+          '    window.onmessage = function(e) {' +
+          '        navigator.requestMediaKeySystemAccess("' + config.keysystem + '", [{' +
+          '           initDataTypes: [\"' + config.initDataType + '\"],' +
+          '           audioCapabilities: [' +
+          '               { contentType:\'' + config.audioType + '\'},' +
+          '           ]' +
+          '       }]).then(function(access) {' +
+          '            return access.createMediaKeys();' +
+          '        }).then(function(mediaKeys) {' +
+          '            window.parent.postMessage({result: \'allowed\'}, \'*\');' +
+          '        }, function(error) {' +
+          '            window.parent.postMessage({result: \'failed\'}, \'*\');' +
+          '        });' +
+          '    };' +
+          '<\/script>';
+
+        // Verify that this page can create a MediaKeys first.
+        return navigator.requestMediaKeySystemAccess(config.keysystem, [{
+            initDataTypes: [config.initDataType],
+            audioCapabilities: [
+                {contentType: config.audioType},
+            ]
+        }]).then(function (access) {
+            return access.createMediaKeys();
+        }).then(function (mediaKeys) {
+            // Success, so now create the iframe and try there.
+            return load_iframe(script, 'allow-scripts');
+        }).then(function (iframe) {
+            iframe.contentWindow.postMessage({}, '*');
+            return wait_for_message();
+        }).then(function (message) {
+            assert_equals(message.result, 'failed');
+        });
+    }, 'Unique origin is unable to create MediaKeys');
+}