Add parser support for using a URI in a part-of directive

pkg/analyzer/lib/src/generated/engine.dart

Index: pkg/analyzer/lib/src/generated/engine.dart
diff --git a/pkg/analyzer/lib/src/generated/engine.dart b/pkg/analyzer/lib/src/generated/engine.dart
index 96bd170c70c4881e09c037c38f79df98fd6f5fc7..0301ed00c7f30d053673b68fa2e8167c0acf582f 100644
--- a/pkg/analyzer/lib/src/generated/engine.dart
+++ b/pkg/analyzer/lib/src/generated/engine.dart
@@ -1155,6 +1155,11 @@ abstract class AnalysisOptions {
   bool get enableTiming;
 
   /**
+   * Return `true` to enable the use of URIs in part-of directives.
+   */
+  bool get enableUriInPartOf;
+
+  /**
    * Return a list of error processors that are to be used when reporting
    * errors in some analysis context.
    */
@@ -1351,6 +1356,9 @@ class AnalysisOptionsImpl implements AnalysisOptions {
   List<String> _excludePatterns;
 
   @override
+  bool enableUriInPartOf = false;
+
+  @override
   bool generateImplicitErrors = true;
 
   @override