Make print interceptable.

sdk/lib/_internal/lib/collection_dev_patch.dart

Index: sdk/lib/_internal/lib/collection_dev_patch.dart
diff --git a/sdk/lib/_internal/lib/collection_dev_patch.dart b/sdk/lib/_internal/lib/collection_dev_patch.dart
index f224f24aab6db81fdd02fe889ed215cbb223c6e5..9b3ec10af829f614b33cc53d002139d2878f20c1 100644
--- a/sdk/lib/_internal/lib/collection_dev_patch.dart
+++ b/sdk/lib/_internal/lib/collection_dev_patch.dart
@@ -2,7 +2,13 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+import 'dart:_js_helper' show Primitives;
+
 patch class Symbol implements core.Symbol {
   patch const Symbol(String name)
       : this._name = name;
 }
+
+patch void consolePrint(String line) {
+  Primitives.printString(line);

[kasperl, 2013/10/15 13:14:46]

Maybe inline the Primitives.printString method in here?

[floitsch, 2013/10/15 13:46:49]

Could do, but I thought that we wanted to avoid "JS" outside the js_helper
library.
Should I inline?

[kasperl, 2013/10/15 14:01:27]

I think it would be nice to get rid of Primitives.printString. We do use the JS
helper from outside libraries -- for one example you can take a look at the
patch that contains hash maps, etc.

[floitsch, 2013/10/15 15:56:20]

Done.

[ahe, 2013/11/04 09:02:22]

OK conflicting messages.

I'll discuss this with Kasper.

+}