Add package config support to dart:isolate

sdk/lib/isolate/isolate.dart

Index: sdk/lib/isolate/isolate.dart
diff --git a/sdk/lib/isolate/isolate.dart b/sdk/lib/isolate/isolate.dart
index 8d284d23a10df287f882ab56add2f70ab35b862c..fe3dc52d9f59ed50332b8b9cadf44cd70a6b7a19 100644
--- a/sdk/lib/isolate/isolate.dart
+++ b/sdk/lib/isolate/isolate.dart
@@ -127,6 +127,34 @@ class Isolate {
   external static Isolate get current;
 
   /**
+   * Returns the package root of the current isolate, if any.
+   *
+   * If the isolate is using a [packageConfig] or the isolate has not been
+   * setup for package resolution, this getter returns `null`, otherwise it
+   * returns the package root - a directory that package URIs are resolved
+   * against.
+   */

[rmacnak, 2016/01/13 01:39:00]

Note how this value can differ from Platform.packageRoot.

+  external static Future<Uri> get packageRoot;
+
+  /**
+   * Returns the package root of the current isolate, if any.

[rmacnak, 2016/01/13 01:39:00]

package root => location of the package config

+   *
+   * If the isolate is using a [packageRoot] or the isolate has not been
+   * setup for package resolution, this getter returns `null`, otherwise it
+   * returns the package config URI.
+   */

[rmacnak, 2016/01/13 01:39:00]

Note how this value can differ from Platform.packageConfig.

+  external static Future<Uri> get packageConfig;
+
+  /**
+   * Maps a package: URI to a non-package Uri.
+   *
+   * If there is no valid mapping from the package: URI in the current
+   * isolate, then this call returns `null`. Non-package: URI are

[rmacnak, 2016/01/13 01:39:00]

Non-package: URIs

[Ivan Posva, 2016/01/13 02:13:15]

Done.

+   * returned unmodified.
+   */
+  external static Future<Uri> resolvePackageUri(Uri packageUri);
+
+  /**
    * Creates and spawns an isolate that shares the same code as the current
    * isolate.
    *
@@ -244,7 +272,9 @@ class Isolate {
        bool errorsAreFatal,
        bool checked,
        Map<String, String> environment,
-       Uri packageRoot});
+       Uri packageRoot,
+       Uri packageConfig,
+       bool automaticPackageResolution: false});
 
   /**
    * Requests the isolate to pause.