Change core lib, dart2js, and more for new optional parameters syntax

lib/core/date.dart

Index: lib/core/date.dart
===================================================================
--- lib/core/date.dart	(revision 13392)
+++ lib/core/date.dart	(working copy)
@@ -43,19 +43,19 @@
    * in the local time zone if [isUtc] is false.
    *
    * [month] and [day] are one-based. For example
-   * [:new Date(1938, 1, 10)] represents the 10th of January 1938.
+   * [:new Date(1938, month: 1, day: 10)] represents the 10th of January 1938.
    */
   factory Date(int year,

[Lasse Reichstein Nielsen, 2012/10/09 12:35:00]

Man, you just hit on our bad consciences there.
We really, really should modify the Date constructors to something useful.

Users will need a version that allows positional parameters too. I'm more
inclined to make Date that constructor, and then possibly have another (by some
name) that allows named parameters. A plain usecase is "new Date(2012,10,05)" or
"new Date(2012,10,05,14,33)". That should still be possible.

I'll loop in Florian who did the Date class.

[Lasse Reichstein Nielsen, 2012/10/09 12:50:40]

Using optional positional parameters will make isUtc hard to use. I talked to
Florian about this, and we agree that the best solution is to have two
constructors:
 Date(int year, [int month = 1, ... ])
and
 Date.utc(int year, [int month ...])

[regis, 2012/10/11 01:33:56]

Done.

[regis, 2012/10/11 01:33:56]

Done.

-               [int month = 1,
-                int day = 1,
-                int hour = 0,
-                int minute = 0,
-                int second = 0,
-                int millisecond = 0,
-                bool isUtc = false]) {
-    return new DateImplementation(year, month, day,
-                                  hour, minute, second,
-                                  millisecond, isUtc);
+               {int month: 1,
+                int day: 1,
+                int hour: 0,
+                int minute: 0,
+                int second: 0,
+                int millisecond: 0,
+                bool isUtc: false}) {
+    return new DateImplementation(year, month: month, day: day,

[Lasse Reichstein Nielsen, 2012/10/09 12:35:00]

Modify to match requested change in DateImplementation.

[regis, 2012/10/11 01:33:56]

Done.

+                                  hour: hour, minute: minute, second: second,
+                                  millisecond: millisecond, isUtc: isUtc);
   }
 
   /**
@@ -82,7 +82,7 @@
   // tools don't yet. Eventually we want to have default values here.
   // TODO(lrn): Have two constructors instead of taking an optional bool.
   factory Date.fromMillisecondsSinceEpoch(int millisecondsSinceEpoch,
-                                          [bool isUtc = false]) {
+                                          {bool isUtc: false}) {
     return new DateImplementation.fromMillisecondsSinceEpoch(
         millisecondsSinceEpoch, isUtc);
   }