Return an absolute URI for Platform.script.

sdk/lib/io/platform.dart

Index: sdk/lib/io/platform.dart
diff --git a/sdk/lib/io/platform.dart b/sdk/lib/io/platform.dart
index 16d0a1e65cacfb3f7bdcca04b1a04ca6ff7b078f..ccbbb3fb89e8b57216b39d12d67edcf637f489d3 100644
--- a/sdk/lib/io/platform.dart
+++ b/sdk/lib/io/platform.dart
@@ -80,9 +80,14 @@ class Platform {
   static String get executable => _Platform.executable;
 
   /**
-   * Returns the URI of the script being run in this
-   * isolate. If the URI is relative it is relative to the file URI of
-   * the working directory of the VM when it was started.
+   * Returns the absolute URI of the script being run in this
+   * isolate. If the script argument on the command line is relative,

[Anders Johnsen, 2013/11/01 10:13:51]

Newline*2 before `If`.

[Bill Hesse, 2013/11/01 12:49:46]

Done.

+   * it is resolved to an absolute URI before fetching the script, and
+   * this absolute URI is returned.
+   *
+   * This implies that a path including "link/.." in the script name

[Søren Gjesse, 2013/11/01 10:17:28]

Instead of trying to examplify here maybe just say something like URI resolving
is pure string operation and might not be the same as file system's path
resolution.

[Bill Hesse, 2013/11/01 12:49:46]

Done.  I think the specific case is worth including, because it is the most
important one.

+   * is resolved by dropping the link component, which may be different
+   * from the file system's path resolution behavior.
    *
    * If the executable environment does not support [script] an empty
    * URI is returned.