Add getter for lineMode and echoMode for Stdin.

runtime/bin/stdin_linux.cc

Index: runtime/bin/stdin_linux.cc
diff --git a/runtime/bin/stdin_linux.cc b/runtime/bin/stdin_linux.cc
index 4f951987c9819ad3cf4bbd099bd0eb7de59affb4..c64610aed7283c00b59b4f3609b29f14312a20cd 100644
--- a/runtime/bin/stdin_linux.cc
+++ b/runtime/bin/stdin_linux.cc
@@ -25,6 +25,13 @@ int Stdin::ReadByte() {
 }
 
 
+bool Stdin::GetEchoMode() {
+  struct termios term;
+  tcgetattr(fileno(stdin), &term);
+  return (term.c_lflag & ECHO) != 0;
+}
+
+
 void Stdin::SetEchoMode(bool enabled) {
   struct termios term;
   tcgetattr(fileno(stdin), &term);
@@ -37,6 +44,13 @@ void Stdin::SetEchoMode(bool enabled) {
 }
 
 
+bool Stdin::GetLineMode() {
+  struct termios term;
+  tcgetattr(fileno(stdin), &term);
+  return (term.c_lflag & ICANON) != 0;
+}
+
+
 void Stdin::SetLineMode(bool enabled) {
   struct termios term;
   tcgetattr(fileno(stdin), &term);