Add W3C encrypted-media tests

third_party/WebKit/LayoutTests/imported/wpt/encrypted-media/scripts/playback-temporary-waitingforkey.js

+function runTest(config,qualifier) {
+
+    // config.initData contains a list of keys. We expect those to be needed in order and get
+    // one waitingforkey event for each one.
+
+    var testname = testnamePrefix(qualifier, config.keysystem)
+                                    + ', successful playback, temporary, '
+                                    + /video\/([^;]*)/.exec(config.videoType)[1]
+                                    + ', waitingforkey event, '
+                                    + config.initData.length + ' key' + (config.initData.length > 1 ? 's' : '');
+
+    var configuration = {   initDataTypes: [ config.initDataType ],
+                            audioCapabilities: [ { contentType: config.audioType } ],
+                            videoCapabilities: [ { contentType: config.videoType } ],
+                            sessionTypes: [ 'temporary' ] };
+
+    async_test(function(test) {
+        var _video = config.video,
+            _mediaKeys,
+            _mediaKeySessions = [],
+            _mediaSource;
+
+        function onFailure(error) {
+            forceTestFailureFromPromise(test, error);
+        }
+
+        function onMessage(event) {
+            config.messagehandler( event.messageType, event.message ).then( function( response ) {
+                return event.target.update( response );
+            }).catch(onFailure);
+        }
+
+        function onWaitingForKey(event) {
+            // Expect one waitingforkey event for each initData we were given
+            assert_less_than(_mediaKeySessions.length, config.initData.length);
+            var mediaKeySession = _mediaKeys.createSession( 'temporary' );
+            waitForEventAndRunStep('message', mediaKeySession, onMessage, test);
+            _mediaKeySessions.push(mediaKeySession);
+            mediaKeySession.generateRequest(config.initDataType, config.initData[_mediaKeySessions.length - 1]).catch(onFailure);
+        }
+
+        function onTimeupdate(event) {
+            if (_video.currentTime > (config.duration || 1)) {
+                assert_equals(_mediaKeySessions.length, config.initData.length);
+                _video.removeEventListener('timeupdate', onTimeupdate);
+                _video.pause();
+                test.done();
+            }
+        }
+
+        navigator.requestMediaKeySystemAccess(config.keysystem, [configuration]).then(function(access) {
+            return access.createMediaKeys();
+        }).then(function(mediaKeys) {
+            _mediaKeys = mediaKeys;
+            return _video.setMediaKeys(_mediaKeys);
+        }).then(function(){
+            waitForEventAndRunStep('waitingforkey', _video, onWaitingForKey, test);
+
+            // Not using waitForEventAndRunStep() to avoid too many
+            // EVENT(onTimeUpdate) logs.
+            _video.addEventListener('timeupdate', onTimeupdate, true);
+            return testmediasource(config);
+        }).then(function(source) {
+            _mediaSource = source;
+            _video.src = URL.createObjectURL(_mediaSource);
+            return source.done;
+        }).then(function(){
+            _video.play();
+        }).catch(onFailure);
+    }, testname);
+}