Fix script entry case of SdkExtUriResolver.restoreAbsolute

pkg/analyzer/lib/source/sdk_ext.dart

Index: pkg/analyzer/lib/source/sdk_ext.dart
diff --git a/pkg/analyzer/lib/source/sdk_ext.dart b/pkg/analyzer/lib/source/sdk_ext.dart
index 7caad4359c4ef100b357fa9c7f2315a3a0e7a1fa..d16bb4775ed28d1c5aaacfb7d7f903f39636e5ab 100644
--- a/pkg/analyzer/lib/source/sdk_ext.dart
+++ b/pkg/analyzer/lib/source/sdk_ext.dart
@@ -76,13 +76,25 @@ class SdkExtUriResolver extends UriResolver {
 
   @override
   Uri restoreAbsolute(Source source) {
-    String libraryName = _libraryName(source.uri);
-    if (_registeredSdkExtension(libraryName)) {
-      return source.uri;
+    String extensionName = _findExtensionNameFor(source.fullName);
+    if (extensionName != null) {
+      return Uri.parse(extensionName);
     }
+    // TODO(johnmccutchan): Handle restoring parts.
     return null;
   }
 
+  /// Return the extension name for [fullName] or `null`.
+  String _findExtensionNameFor(String fullName) {
+    var result;
+    _urlMappings.forEach((extensionName, pathMapping) {
+      if (pathMapping == fullName) {
+        result = extensionName;
+      }
+    });
+    return result;
+  }
+
   /// Return the library name of [importUri].
   String _libraryName(Uri importUri) {
     var uri = importUri.toString();
@@ -152,11 +164,6 @@ class SdkExtUriResolver extends UriResolver {
     }
   }
 
-  /// Returns true if [libraryName] is a registered sdk extension.
-  bool _registeredSdkExtension(String libraryName) {
-    return _urlMappings[libraryName] != null;
-  }
-
   /// Resolve an import of an sdk extension.
   Source _resolveEntry(Uri libraryEntry, Uri importUri) {
     // Library entry.