Add getter for hasTerminal, terminalColumns and terminalLines on stdout.

sdk/lib/_internal/lib/io_patch.dart

Index: sdk/lib/_internal/lib/io_patch.dart
diff --git a/sdk/lib/_internal/lib/io_patch.dart b/sdk/lib/_internal/lib/io_patch.dart
index 7f11b28c822654ee1f03ed2d11ef505539937789..4321ab8fe9ecb083ac5b9af0a253d1d957a6fc14 100644
--- a/sdk/lib/_internal/lib/io_patch.dart
+++ b/sdk/lib/_internal/lib/io_patch.dart
@@ -313,7 +313,7 @@ patch class _StdIOUtils {
   patch static Stdin _getStdioInputStream() {
     throw new UnsupportedError("StdIOUtils._getStdioInputStream");
   }
-  patch static IOSink _getStdioOutputStream(int fd) {
+  patch static _getStdioOutputStream(int fd) {
     throw new UnsupportedError("StdIOUtils._getStdioOutputStream");
   }
   patch static int _socketType(nativeSocket) {
@@ -360,6 +360,18 @@ patch class Stdin {
   }
 }
 
+patch class Stdout {
+  patch bool get hasTerminal {
+    throw new UnsupportedError("Stdout.hasTerminal");
+  }
+  patch int get terminalColumns {
+    throw new UnsupportedError("Stdout.terminalColumns");
+  }
+  patch int get terminalLines {
+    throw new UnsupportedError("Stdout.terminalLines");
+  }
+}
+
 patch class _FileSystemWatcher {
   patch static Stream<FileSystemEvent> watch(
       String path, int events, bool recursive) {