Use checked-in .package file for building and testing

utils/compiler/create_snapshot.dart

Index: utils/compiler/create_snapshot.dart
diff --git a/utils/compiler/create_snapshot.dart b/utils/compiler/create_snapshot.dart
index 1a274310cb5909458e38be3809e2fce9dec9adf6..2b5b869c50a69622e66c2db9ca70b2d0ec988a43 100644
--- a/utils/compiler/create_snapshot.dart
+++ b/utils/compiler/create_snapshot.dart
@@ -61,10 +61,9 @@ void writeSnapshotFile(var path, var content) {
     writer.close();
 }
 
-Future createSnapshot(var dart_file, var packageRoot) {
+Future createSnapshot(var dart_file) {
   return Process.run(Platform.executable,
-                     ["--package-root=$packageRoot",
-                      "--snapshot=$dart_file.snapshot",
+                     ["--snapshot=$dart_file.snapshot",
                       dart_file])
       .then((result) {
         if (result.exitCode != 0) {
@@ -80,11 +79,9 @@ Future createSnapshot(var dart_file, var packageRoot) {
  * Takes the following arguments:
  * --output_dir=val     The full path to the output_dir.
  * --dart2js_main=val   The path to the dart2js main script relative to root.
- * --package-root=val   The package-root used to find packages for the snapshot.
  */
 void main(List<String> arguments) {
-  var validArguments = ["--output_dir", "--dart2js_main",
-                        "--package_root"];
+  var validArguments = ["--output_dir", "--dart2js_main"];
   var args = {};
   for (var argument in arguments) {
     var argumentSplit = argument.split("=");
@@ -96,7 +93,6 @@ void main(List<String> arguments) {
   }
   if (!args.containsKey("dart2js_main")) throw "Please specify dart2js_main";
   if (!args.containsKey("output_dir")) throw "Please specify output_dir";
-  if (!args.containsKey("package_root")) throw "Please specify package_root";
 
   var scriptFile = Uri.base.resolveUri(Platform.script);
   var path = scriptFile.resolve(".");
@@ -104,13 +100,13 @@ void main(List<String> arguments) {
   getSnapshotGenerationFile(args, rootPath).then((result) {
     var wrapper = "${args['output_dir']}/utils_wrapper.dart";
     writeSnapshotFile(wrapper, result);
-    createSnapshot(wrapper, args["package_root"]);
+    createSnapshot(wrapper);
   });
 
   getDart2jsSnapshotGenerationFile(args, rootPath).then((result) {
     var wrapper = "${args['output_dir']}/dart2js.dart";
     writeSnapshotFile(wrapper, result);
-    createSnapshot(wrapper, args["package_root"]);
+    createSnapshot(wrapper);
   });
 
 }