Use absolute URIs for LinkedDependency.uri/parts.

pkg/analyzer/lib/src/summary/idl.dart

Index: pkg/analyzer/lib/src/summary/idl.dart
diff --git a/pkg/analyzer/lib/src/summary/idl.dart b/pkg/analyzer/lib/src/summary/idl.dart
index e6f142dd8dc939dbc15f2fc73239d96d375406df..3389fee6f4c634f6797c63c226bbb3d6618f8781 100644
--- a/pkg/analyzer/lib/src/summary/idl.dart
+++ b/pkg/analyzer/lib/src/summary/idl.dart
@@ -596,18 +596,14 @@ enum IndexSyntheticElementKind {
  */
 abstract class LinkedDependency extends base.SummaryClass {
   /**
-   * URI for the compilation units listed in the library's `part` declarations.
-   * These URIs are relative to the importing library.
+   * Absolute URI for the compilation units listed in the library's `part`
+   * declarations, empty string for invalid URI.
    */
   @Id(1)
   List<String> get parts;
 
   /**
-   * The relative URI of the dependent library.  This URI is relative to the
-   * importing library, even if there are intervening `export` declarations.
-   * So, for example, if `a.dart` imports `b/c.dart` and `b/c.dart` exports
-   * `d/e.dart`, the URI listed for `a.dart`'s dependency on `e.dart` will be
-   * `b/d/e.dart`.
+   * The absolute URI of the dependent library, e.g. `package:foo/bar.dart`.
    */
   @Id(0)
   String get uri;