Use absolute URIs for LinkedDependency.uri/parts.

pkg/analyzer/test/src/summary/resynthesize_common.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
 library test.src.serialization.elements_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
 import 'package:analyzer/dart/constant/value.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 4444 matching lines @@
 library lib;
 export 'a.dart';
 part 'b.dart';
 ''');
     checkLibrary('''
 import 'c.dart';
 C v = null;
 ''');
   }
 
+  test_nameConflict_importWithRelativeUri_exportWithAbsolute() {
+    if (resourceProvider.pathContext.separator != '/') {
+      return;
+    }
+
+    addLibrarySource('/a.dart', 'class A {}');
+    addLibrarySource('/b.dart', 'export "/a.dart";');
+    checkLibrary('''
+import 'a.dart';
+import 'b.dart';
+A v = null;
+''');
+  }
+
   test_nested_generic_functions_in_generic_class_with_function_typed_params() {
     checkLibrary('''
 class C<T, U> {
   void g<V, W>() {
     void h<X, Y>(void p(T t, U u, V v, W w, X x, Y y)) {
     }
   }
 }
 ''');
   }
@@ skipping 795 matching lines @@
       fail('Unexpectedly tried to get unlinked summary for $uri');
     }
     return serializedUnit;
   }
 
   @override
   bool hasLibrarySummary(String uri) {
     return true;
   }
 }