[NaCl SDK] nacl_io: Add initial implementations of kill and signal

native_client_sdk/src/libraries/nacl_io/mount_node_tty.h

Index: native_client_sdk/src/libraries/nacl_io/mount_node_tty.h
diff --git a/native_client_sdk/src/libraries/nacl_io/mount_node_tty.h b/native_client_sdk/src/libraries/nacl_io/mount_node_tty.h
index 87c8191506d3fd0b0b7bb10479defd83afac9c00..c333b280b1c3d3b43b4cf07380da598d5448bbd1 100644
--- a/native_client_sdk/src/libraries/nacl_io/mount_node_tty.h
+++ b/native_client_sdk/src/libraries/nacl_io/mount_node_tty.h
@@ -58,9 +58,14 @@ class MountNodeTty : public MountNodeCharDevice {
 
   std::deque<char> input_buffer_;
   bool is_readable_;
+  bool did_resize_;
   pthread_cond_t is_readable_cond_;
   std::string prefix_;
   struct termios termios_;
+  /// Current height of terminal in rows.
+  int rows_;
+  /// Current width of terminal in columns.
+  int cols_;
 };
 
 }