Roll Observatory packages and add a roll script

packages/analyzer/lib/src/generated/utilities_dart.dart

Index: packages/analyzer/lib/src/generated/utilities_dart.dart
diff --git a/analyzer/lib/src/generated/utilities_dart.dart b/packages/analyzer/lib/src/generated/utilities_dart.dart
similarity index 92%
rename from analyzer/lib/src/generated/utilities_dart.dart
rename to packages/analyzer/lib/src/generated/utilities_dart.dart
index cd9753ca4772af05c154dc5c8a1a0504dae58403..882d1826811c3609e769d55be5d836073e27ef8c 100644
--- a/analyzer/lib/src/generated/utilities_dart.dart
+++ b/packages/analyzer/lib/src/generated/utilities_dart.dart
@@ -2,14 +2,39 @@
 // 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.
 
-// This code was auto-generated, is not intended to be edited, and is subject to
-// significant change. Please see the README file for more information.
-
 library engine.utilities.dart;
 
 import 'java_core.dart';
 
 /**
+ * Check whether [uri1] starts with (or 'is prefixed by') [uri2] by checking
+ * path segments.
+ */
+bool startsWith(Uri uri1, Uri uri2) {
+  List<String> uri1Segments = uri1.pathSegments;
+  List<String> uri2Segments = uri2.pathSegments.toList();
+  // Punt if empty (https://github.com/dart-lang/sdk/issues/24126)
+  if (uri2Segments.isEmpty) {
+    return false;
+  }
+  // Trim trailing empty segments ('/foo/' => ['foo', ''])
+  if (uri2Segments.last == '') {
+    uri2Segments.removeLast();
+  }
+
+  if (uri2Segments.length > uri1Segments.length) {
+    return false;
+  }
+
+  for (int i = 0; i < uri2Segments.length; ++i) {
+    if (uri2Segments[i] != uri1Segments[i]) {
+      return false;
+    }
+  }
+  return true;
+}
+
+/**
  * The enumeration `ParameterKind` defines the different kinds of parameters. There are two
  * basic kinds of parameters: required and optional. Optional parameters are further divided into
  * two kinds: positional optional and named optional.
@@ -38,27 +63,3 @@ class ParameterKind extends Enum<ParameterKind> {
   const ParameterKind(String name, int ordinal, this.isOptional)
       : super(name, ordinal);
 }
-
-/**
- * Check whether [uri1] starts with (or 'is prefixed by') [uri2] by checking
- * path segments.
- */
-bool startsWith(Uri uri1, Uri uri2) {
-  List<String> uri1Segments = uri1.pathSegments;
-  List<String> uri2Segments = uri2.pathSegments.toList();
-  // Trim trailing empty segments ('/foo/' => ['foo', ''])
-  if (uri2Segments.last == '') {
-    uri2Segments.removeLast();
-  }
-
-  if (uri2Segments.length > uri1Segments.length) {
-    return false;
-  }
-
-  for (int i = 0; i < uri2Segments.length; ++i) {
-    if (uri2Segments[i] != uri1Segments[i]) {
-      return false;
-    }
-  }
-  return true;
-}