Implement break signal for serial api.

device/serial/serial_io_handler.h

Index: device/serial/serial_io_handler.h
diff --git a/device/serial/serial_io_handler.h b/device/serial/serial_io_handler.h
index 1b2a8c49d4ac47fd0dca17174c6e9d50da4d23b6..d59eb543f1c6f2543777f6d82b11f11fc3e0fa03 100644
--- a/device/serial/serial_io_handler.h
+++ b/device/serial/serial_io_handler.h
@@ -44,7 +44,7 @@ class SerialIoHandler : public base::NonThreadSafe,
   void Read(scoped_ptr<WritableBuffer> buffer);
 
   // Performs an async Write operation. Behavior is undefined if this is called
-  // while a Write is already pending. Otherwise, the Done or DoneWithError
+  // while a Write is already pending. Otherwise, the Done or DoneWithError //

[Ken Rockot(use gerrit already), 2015/06/10 19:07:18]

please remove this change

[limasdf, 2015/06/11 22:14:23]

Done.

   // method on |buffer| will eventually be called with a result.
   void Write(scoped_ptr<ReadOnlyBuffer> buffer);
 
@@ -83,6 +83,14 @@ class SerialIoHandler : public base::NonThreadSafe,
   // successfully retrieved.
   virtual serial::ConnectionInfoPtr GetPortInfo() const = 0;
 
+  // Initiates a BREAK signal. Places the transmission line in a break state
+  // until the |ClearBreak| is called.
+  virtual bool SetBreak() = 0;
+
+  // Terminates the BREAK signal. Places the transmission line in a nonbreak
+  // state.
+  virtual bool ClearBreak() = 0;
+
  protected:
   explicit SerialIoHandler(
       scoped_refptr<base::SingleThreadTaskRunner> file_thread_task_runner,