Use checked-in .package file for building and testing

tests/compiler/dart2js/analyze_helper.dart

 // Copyright (c) 2016, 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 analyze_helper;
 
 import 'dart:async';
 import 'dart:io';
 import 'package:compiler/compiler.dart' as api;
 import 'package:compiler/src/apiimpl.dart';
@@ skipping 202 matching lines @@
 
 
 ===
 === NOTE: If this test fails, update [WHITE_LIST] in $testFileName
 ===
 
 
 """);
 
   var libraryRoot = currentDirectory.resolve('sdk/');
-  var packageRoot =
-      currentDirectory.resolve(Platform.packageRoot);
+  var packageConfig = currentDirectory.resolve('.packages');
   var provider = new CompilerSourceFileProvider();
   var handler = new CollectingDiagnosticHandler(whiteList, skipList, provider);
   options = <String>[Flags.analyzeOnly, '--categories=Client,Server',
       Flags.showPackageWarnings]..addAll(options);
   switch (mode) {
     case AnalysisMode.URI:
     case AnalysisMode.MAIN:
       options.add(Flags.analyzeMain);
       break;
     case AnalysisMode.ALL:
       options.add(Flags.analyzeAll);
       break;
     case AnalysisMode.TREE_SHAKING:
       break;
   }
   if (options.contains(Flags.verbose)) {
     handler.verbose = true;
   }
   if (options.contains(HIDE_WHITELISTED)) {
     handler.showWhitelisted = false;
   }
   var compiler = new CompilerImpl(
       provider,
       null,
       handler,
       new CompilerOptions.parse(
           libraryRoot: libraryRoot,
-          packageRoot: packageRoot,
+          packageConfig: packageConfig,
           options: options,
           environment: {}));
   String MESSAGE = """
 
 
 ===
 === ERROR: Unexpected result of analysis.
 ===
 === Please update [WHITE_LIST] in $testFileName
 ===
@@ skipping 17 matching lines @@
   if (checkResults != null) {
     result = checkResults(compiler, handler);
   } else {
     result = handler.checkResults();
   }
   if (!result) {
     print(MESSAGE);
     exit(1);
   }
 }