[dart:io] Move Platform.ansiSupported to {Stdin,Stdout}.supportsAnsiEscapes

runtime/bin/stdio_fuchsia.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #if !defined(DART_IO_DISABLED)
 
 #include "platform/globals.h"
 #if defined(HOST_OS_FUCHSIA)
 
 #include "bin/stdio.h"
@@ skipping 24 matching lines @@
   return false;
 }
 
 
 bool Stdin::SetLineMode(bool enabled) {
   UNIMPLEMENTED();
   return false;
 }
 
 
+bool Stdin::AnsiSupported(bool* supported) {
+  UNIMPLEMENTED();
+  return false;
+}
+
+
 bool Stdout::GetTerminalSize(intptr_t fd, int size[2]) {
   UNIMPLEMENTED();
   return false;
 }
 
+
+bool Stdout::AnsiSupported(intptr_t fd, bool* supported) {
+  UNIMPLEMENTED();
+  return false;
+}
+
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(HOST_OS_FUCHSIA)
 
 #endif  // !defined(DART_IO_DISABLED)