Build libaddressinput in Chrome for requestAutocomplete().

third_party/libaddressinput/chromium/util/json.cc

+// Copyright 2013 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 "base/json/json_reader.h"
+#include "base/logging.h"
+#include "util/json.h"
+
+namespace i18n {
+namespace addressinput {
+
+Json::Json() {}
+Json::~Json() {}
+
+bool Json::ParseObject(const std::string& json) {
+  dict_.reset();
+
+  // |json| is converted to a |c_str()| here because rapidjson and other parts
+  // of the standalone library use char* rather than std::string.
+  scoped_ptr<base::Value> parsed(base::JSONReader::Read(json.c_str()));
+  if (parsed && parsed->IsType(base::Value::TYPE_DICTIONARY))
+    dict_.reset(static_cast<base::DictionaryValue*>(parsed.release()));
+
+  return !!dict_;
+}
+
+bool Json::HasStringValueForKey(const std::string& key) const {
+  const base::Value* val = NULL;
+
+  if (dict_)

[please use gerrit instead, 2013/11/20 00:07:58]

Simpler:

  DCHECK(dict_);
  dict_->GetWithoutPathExpansion(key, &val);

(I promise libaddressinput will not call HasStringValueForKey() if ParseObject()
returned false.)

[Dan Beam, 2013/11/20 00:58:45]

scoped_ptr::operator->() has a DCHECK() so i'll just remove the NULL handling

+    dict_->GetWithoutPathExpansion(key, &val);
+  else
+    NOTREACHED();
+
+  return val && val->IsType(base::Value::TYPE_STRING);
+}
+
+std::string Json::GetStringValueForKey(const std::string& key) const {
+  std::string result;
+
+  if (dict_)

[please use gerrit instead, 2013/11/20 00:07:58]

Ditto:

  DCHECK(dict_);
  dict_->GetStringWithoutPathExpansion(key, &result);

Also, libaddressinput will not call GetStringValueForKey() if
HasStringValueForKey() returned false.

[Dan Beam, 2013/11/20 00:58:45]

Done.

+    dict_->GetStringWithoutPathExpansion(key, &result);
+  else
+    NOTREACHED();
+
+  return result;
+}
+
+}  // namespace addressinput
+}  // namespace i18n