Add W3C encrypted-media tests

third_party/WebKit/LayoutTests/imported/wpt/encrypted-media/scripts/update-disallowed-input.js

+function runTest(config)
+{
+    // This test passes |response| to update() as a JSON Web Key Set.
+    // CDMs other than Clear Key won't expect |response| in this format.
+    promise_test(function(test) {
+        var initDataType;
+        var initData;
+        var keySystem = config.keysystem;
+        var mediaKeySession;
+
+        function createReallyLongJWKSet()
+        {
+            // This is just a standard JWKSet with a lot of
+            // extra items added to the end. Key ID and key
+            // doesn't really matter.
+            var jwkSet = '{"keys":[{'
+                       +     '"kty":"oct",'
+                       +     '"k":"MDEyMzQ1Njc4OTAxMjM0NQ",'
+                       +     '"kid":"MDEyMzQ1Njc4OTAxMjM0NQ"'
+                       + '}]';
+            return jwkSet + ',"test":"unknown"'.repeat(4000) + '}';
+        }
+
+        return navigator.requestMediaKeySystemAccess(keySystem, getSimpleConfiguration()).then(function(access) {
+            initDataType = access.getConfiguration().initDataTypes[0];
+            initData = getInitData(initDataType);
+            return access.createMediaKeys();
+        }).then(function(mediaKeys) {
+            mediaKeySession = mediaKeys.createSession();
+            var eventWatcher = new EventWatcher(test, mediaKeySession, ['message']);
+            var promise = eventWatcher.wait_for('message');
+            mediaKeySession.generateRequest(initDataType, initData);
+            return promise;
+        }).then(function () {
+            var jwkSet = createReallyLongJWKSet();
+            assert_greater_than(jwkSet.length, 65536);
+            var jwkSetArray = stringToUint8Array(jwkSet);
+            return mediaKeySession.update(jwkSetArray);
+        }).then(function () {
+            assert_unreached('update() with a response longer than 64Kb succeed');
+        }).catch(function (error) {
+            assert_equals(error.name, 'TypeError');
+        });
+    }, 'update() with invalid response (longer than 64Kb characters) should fail.');
+}