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

mojo/public/dart/third_party/unittest/lib/src/utils.dart

+// 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 unittest.utils;
+
+import 'package:stack_trace/stack_trace.dart';
+
+/// Indent each line in [str] by two spaces.
+String indent(String str) =>
+    str.replaceAll(new RegExp("^", multiLine: true), "  ");
+
+/// A pair of values.
+class Pair<E, F> {
+  final E first;
+  final F last;
+
+  Pair(this.first, this.last);
+
+  String toString() => '($first, $last)';
+
+  bool operator ==(other) {
+    if (other is! Pair) return false;
+    return other.first == first && other.last == last;
+  }
+
+  int get hashCode => first.hashCode ^ last.hashCode;
+}
+
+/// Returns a Trace object from a StackTrace object or a String, or the
+/// unchanged input if formatStacks is false;
+Trace getTrace(stack, bool formatStacks, bool filterStacks) {
+  Trace trace;
+  if (stack == null || !formatStacks) return null;
+  if (stack is String) {
+    trace = new Trace.parse(stack);
+  } else if (stack is StackTrace) {
+    trace = new Trace.from(stack);
+  } else {
+    throw new Exception('Invalid stack type ${stack.runtimeType} for $stack.');
+  }
+
+  if (!filterStacks) return trace;
+
+  // Format the stack trace by removing everything above TestCase._runTest,
+  // which is usually going to be irrelevant. Also fold together unittest and
+  // core library calls so only the function the user called is visible.
+  return new Trace(trace.frames.takeWhile((frame) {
+    return frame.package != 'unittest' || frame.member != 'TestCase._runTest';
+  })).terse.foldFrames((frame) => frame.package == 'unittest' || frame.isCore);
+}