Added HostKeyPair class, signatures for heartbeat messages.

remoting/host/json_host_config.cc

 // Copyright (c) 2010 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 "remoting/host/json_host_config.h"
 
 #include "base/file_util.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/message_loop_proxy.h"
 #include "base/task.h"
 #include "base/values.h"
 
 namespace remoting {
 
 JsonHostConfig::JsonHostConfig(
     const FilePath& filename,
     base::MessageLoopProxy* file_message_loop_proxy)
     : filename_(filename),
+      values_(new DictionaryValue()),
       message_loop_proxy_(file_message_loop_proxy) {
 }
 
 bool JsonHostConfig::Read() {
   // TODO(sergeyu): Implement better error handling here.
   std::string file_content;
   if (!file_util::ReadFileToString(filename_, &file_content)) {
     return false;
   }
 
@@ skipping 44 matching lines @@
 
 void JsonHostConfig::DoWrite() {
   std::string file_content;
   base::JSONWriter::Write(values_.get(), true, &file_content);
   AutoLock auto_lock(lock_);
   // TODO(sergeyu): Move ImportantFileWriter to base and use it here.
   file_util::WriteFile(filename_, file_content.c_str(), file_content.size());
 }
 
 }  // namespace remoting