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

mojo/public/dart/third_party/csslib/lib/src/tree_base.dart

+// Copyright (c) 2012, 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.
+
+part of csslib.visitor;
+
+/**
+ * The base type for all nodes in a CSS abstract syntax tree.
+ */
+abstract class TreeNode {
+  /** The source code this [TreeNode] represents. */
+  final SourceSpan span;
+
+  TreeNode(this.span);
+
+  TreeNode clone();
+
+  /** Classic double-dispatch visitor for implementing passes. */
+  void visit(VisitorBase visitor);
+
+  /** A multiline string showing the node and its children. */
+  String toDebugString() {
+    var to = new TreeOutput();
+    var tp = new _TreePrinter(to, true);
+    this.visit(tp);
+    return to.buf.toString();
+  }
+}
+
+/** The base type for expressions. */
+abstract class Expression extends TreeNode {
+  Expression(SourceSpan span) : super(span);
+}
+
+/** Simple class to provide a textual dump of trees for debugging. */
+class TreeOutput {
+  int depth = 0;
+  final StringBuffer buf = new StringBuffer();
+  VisitorBase printer;
+
+  void write(String s) {
+    for (int i = 0; i < depth; i++) {
+      buf.write(' ');
+    }
+    buf.write(s);
+  }
+
+  void writeln(String s) {
+    write(s);
+    buf.write('\n');
+  }
+
+  void heading(String name, [span]) {
+    write(name);
+    if (span != null) {
+      buf.write('  (${span.message('')})');
+    }
+    buf.write('\n');
+  }
+
+  String toValue(value) {
+    if (value == null) return 'null';
+    else if (value is Identifier) return value.name;
+    else return value.toString();
+  }
+
+  void writeNode(String label, TreeNode node) {
+    write('${label}: ');
+    depth += 1;
+    if (node != null) node.visit(printer);
+    else writeln('null');
+    depth -= 1;
+  }
+
+  void writeValue(String label, value) {
+    var v = toValue(value);
+    writeln('${label}: ${v}');
+  }
+
+  void writeNodeList(String label, List<TreeNode> list) {
+    writeln('${label} [');
+    if (list != null) {
+      depth += 1;
+      for (var node in list) {
+        if (node != null) {
+          node.visit(printer);
+        } else {
+          writeln('null');
+        }
+      }
+      depth -= 1;
+      writeln(']');
+    }
+  }
+
+  String toString() => buf.toString();
+}