Improve formatting of accessibility tests that dump the tree.

content/browser/accessibility/dump_accessibility_tree_helper.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/accessibility/dump_accessibility_tree_helper.h"
+
+#include "base/memory/scoped_ptr.h"
+
+namespace {
+const int kIndentSpaces = 4;
+}
+
+void DumpAccessibilityTreeHelper::DumpAccessibilityTree(
+    BrowserAccessibility* node, string16* contents) {
+  RecursiveDumpAccessibilityTree(node, contents, 0);
+}
+
+void DumpAccessibilityTreeHelper::RecursiveDumpAccessibilityTree(
+    BrowserAccessibility* node, string16* contents, int indent) {
+  scoped_array<char> prefix(new char[indent + 1]);
+  for (int i = 0; i < indent; ++i)
+    prefix[i] = ' ';
+  prefix[indent] = '\0';
+
+  *contents += ToString(node, prefix.get());
+  for (size_t i = 0; i < node->children().size(); ++i) {
+    RecursiveDumpAccessibilityTree(node->children()[i], contents,
+                                   indent + kIndentSpaces);
+  }
+}