Make print interceptable.

sdk/lib/_internal/lib/js_helper.dart

Index: sdk/lib/_internal/lib/js_helper.dart
diff --git a/sdk/lib/_internal/lib/js_helper.dart b/sdk/lib/_internal/lib/js_helper.dart
index e346734f1b13f6f0b4f5e06622b5d618d70c3138..1890de0cb0ff4a2dfcb2c009cf5ecf87a71a066c 100644
--- a/sdk/lib/_internal/lib/js_helper.dart
+++ b/sdk/lib/_internal/lib/js_helper.dart
@@ -281,42 +281,6 @@ class Primitives {
 
   static computeGlobalThis() => JS('', 'function() { return this; }()');
 
-  /**
-   * This is the low-level method that is used to implement
-   * [print]. It is possible to override this function from JavaScript
-   * by defining a function in JavaScript called "dartPrint".
-   */
-  static void printString(String string) {

[ahe, 2013/11/04 09:01:19]

In the future, do not move dart2js primitives out of the Primitives class.

The proper thing would have been to call Primitives.printString from
printToConsole.

-    if (JS('bool', r'typeof dartPrint == "function"')) {
-      // Support overriding print from JavaScript.
-      JS('void', r'dartPrint(#)', string);
-      return;
-    }
-
-    // Inside browser or nodejs.
-    if (JS('bool', r'typeof console == "object"') &&
-        JS('bool', r'typeof console.log == "function"')) {
-      JS('void', r'console.log(#)', string);
-      return;
-    }
-
-    // Don't throw inside IE, the console is only defined if dev tools is open.
-    if (JS('bool', r'typeof window == "object"')) {
-      return;
-    }
-
-    // Running in d8, the V8 developer shell, or in Firefox' js-shell.
-    if (JS('bool', r'typeof print == "function"')) {
-      JS('void', r'print(#)', string);
-      return;
-    }
-
-    // This is somewhat nasty, but we don't want to drag in a bunch of
-    // dependencies to handle a situation that cannot happen. So we
-    // avoid using Dart [:throw:] and Dart [toString].
-    JS('void', 'throw "Unable to print message: " + String(#)', string);
-  }
-
   static _throwFormatException(String string) {
     throw new FormatException(string);
   }