[battor agent] Fix the init sequence so it retries inits instead of resets.

tools/battor_agent/battor_connection_impl.cc

 // Copyright 2015 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 "tools/battor_agent/battor_connection_impl.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
@@ skipping 163 matching lines @@
         "the 'already read' buffer had an irrecoverable error with code: %d.",
         parse_message_error));
     EndReadBytes(false, BATTOR_MESSAGE_TYPE_CONTROL, nullptr);
     return;
   }
 
   LogSerial("No complete message found in the 'already read' buffer.");
   BeginReadBytes(message_max_bytes - already_read_buffer_.size());
 }
 
+void BattOrConnectionImpl::CancelReadMessage() {
+  io_handler_->CancelRead(device::serial::ReceiveError::TIMEOUT);
+}
+
 void BattOrConnectionImpl::Flush() {
   io_handler_->Flush();
   already_read_buffer_.clear();
 }
 
 scoped_refptr<device::SerialIoHandler> BattOrConnectionImpl::CreateIoHandler() {
   return device::SerialIoHandler::Create(file_thread_task_runner_,
                                          ui_thread_task_runner_);
 }
 
@@ skipping 146 matching lines @@
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE,
       base::Bind(&Listener::OnBytesSent, base::Unretained(listener_), success));
 }
 
 void BattOrConnectionImpl::LogSerial(const std::string& str) {
   serial_log_ << str << std::endl << std::endl;
 }
 
 }  // namespace battor