Add getter for hasTerminal, terminalColumns and terminalLines on stdout.

runtime/bin/stdio_win.cc

Index: runtime/bin/stdio_win.cc
diff --git a/runtime/bin/stdin_win.cc b/runtime/bin/stdio_win.cc
similarity index 81%
rename from runtime/bin/stdin_win.cc
rename to runtime/bin/stdio_win.cc
index 44e517de7a87d4440c80cb63dd06f14c77968a02..24ceb325cab4ca19dbbeea10c791d32d4c4bc69a 100644
--- a/runtime/bin/stdin_win.cc
+++ b/runtime/bin/stdio_win.cc
@@ -5,7 +5,7 @@
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
-#include "bin/stdin.h"
+#include "bin/stdio.h"
 
 
 namespace dart {
@@ -64,6 +64,16 @@ void Stdin::SetLineMode(bool enabled) {
   SetConsoleMode(h, mode);
 }
 
+
+bool Stdout::GetTerminalSize(int size[2]) {
+  HANDLE h = GetStdHandle(STD_OUTPUT_HANDLE);
+  CONSOLE_SCREEN_BUFFER_INFO info;
+  if (!GetConsoleScreenBufferInfo(h, &info)) return false;
+  size[0] = info.srWindow.Right - info.srWindow.Left + 1;
+  size[1] = info.srWindow.Bottom - info.srWindow.Top + 1;
+  return true;
+}
+
 }  // namespace bin
 }  // namespace dart