Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/source_maps/test/builder_test.dart

Index: mojo/public/dart/third_party/source_maps/test/builder_test.dart
diff --git a/mojo/public/dart/third_party/source_maps/test/builder_test.dart b/mojo/public/dart/third_party/source_maps/test/builder_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ca0ca8d2d88469d4b580cc9158649306e2736590
--- /dev/null
+++ b/mojo/public/dart/third_party/source_maps/test/builder_test.dart
@@ -0,0 +1,32 @@
+// Copyright (c) 2013, 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 test.source_maps_test;
+
+import 'dart:convert';
+import 'package:unittest/unittest.dart';
+import 'package:source_maps/source_maps.dart';
+import 'common.dart';
+
+main() {
+  test('builder - with span', () {
+    var map = (new SourceMapBuilder()
+        ..addSpan(inputVar1, outputVar1)
+        ..addSpan(inputFunction, outputFunction)
+        ..addSpan(inputVar2, outputVar2)
+        ..addSpan(inputExpr, outputExpr))
+        .build(output.url.toString());
+    expect(map, equals(EXPECTED_MAP));
+  });
+
+  test('builder - with location', () {
+    var str = (new SourceMapBuilder()
+        ..addLocation(inputVar1.start, outputVar1.start, 'longVar1')
+        ..addLocation(inputFunction.start, outputFunction.start, 'longName')
+        ..addLocation(inputVar2.start, outputVar2.start, 'longVar2')
+        ..addLocation(inputExpr.start, outputExpr.start, null))
+        .toJson(output.url.toString());
+    expect(str, JSON.encode(EXPECTED_MAP));
+  });
+}