Added timeout parameter to RawSecureSocket and SecureSocket connect methods. Also updated CHANGELOG…

sdk/lib/io/secure_socket.dart

Index: sdk/lib/io/secure_socket.dart
diff --git a/sdk/lib/io/secure_socket.dart b/sdk/lib/io/secure_socket.dart
index 7f2e8cccfb6a621b12da4f3288750b2bc53d08a0..096318b72038ee852704cddcddb2a6f5e4d37fd2 100644
--- a/sdk/lib/io/secure_socket.dart
+++ b/sdk/lib/io/secure_socket.dart
@@ -33,16 +33,25 @@ abstract class SecureSocket implements Socket {
    * order of preference) to use during the ALPN protocol negogiation with the
    * server.  Example values are "http/1.1" or "h2".  The selected protocol
    * can be obtained via [SecureSocket.selectedProtocol].
+   *
+   * The argument [timeout] is used to specify the maximum allowed time to wait
+   * for a connection to be established. If [timeout] is longer than the system
+   * level timeout duration, a timeout may occur sooner than specified in
+   * [timeout]. On timeout, a [SocketException] is thrown and all ongoing
+   * connection attempts to [host] are cancelled.
+
    */
   static Future<SecureSocket> connect(host, int port,
       {SecurityContext context,
       bool onBadCertificate(X509Certificate certificate),
-      List<String> supportedProtocols}) {
+      List<String> supportedProtocols,
+      Duration timeout}) {
     return RawSecureSocket
         .connect(host, port,
             context: context,
             onBadCertificate: onBadCertificate,
-            supportedProtocols: supportedProtocols)
+            supportedProtocols: supportedProtocols,
+            timeout: timeout)
         .then((rawSocket) => new SecureSocket._(rawSocket));
   }
 
@@ -194,10 +203,11 @@ abstract class RawSecureSocket implements RawSocket {
   static Future<RawSecureSocket> connect(host, int port,
       {SecurityContext context,
       bool onBadCertificate(X509Certificate certificate),
-      List<String> supportedProtocols}) {
+      List<String> supportedProtocols,
+      Duration timeout}) {
     _RawSecureSocket._verifyFields(
         host, port, false, false, false, onBadCertificate);
-    return RawSocket.connect(host, port).then((socket) {
+    return RawSocket.connect(host, port, timeout: timeout).then((socket) {
       return secure(socket,
           context: context,
           onBadCertificate: onBadCertificate,