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

runtime/bin/stdio_unsupported.cc

Index: runtime/bin/stdio_unsupported.cc
diff --git a/runtime/bin/stdio_unsupported.cc b/runtime/bin/stdio_unsupported.cc
index 1482f919bbbcde2682adcaa5e8cfdbb445ba52cd..d4c9d0693ca2d6738100ab116b21e249106751ce 100644
--- a/runtime/bin/stdio_unsupported.cc
+++ b/runtime/bin/stdio_unsupported.cc
@@ -41,11 +41,23 @@ void FUNCTION_NAME(Stdin_SetLineMode)(Dart_NativeArguments args) {
 }
 
 
+void FUNCTION_NAME(Stdin_AnsiSupported)(Dart_NativeArguments args) {
+  Dart_ThrowException(
+      DartUtils::NewDartArgumentError("Stdin unsupported on this platform"));
+}
+
+
 void FUNCTION_NAME(Stdout_GetTerminalSize)(Dart_NativeArguments args) {
   Dart_ThrowException(
       DartUtils::NewDartArgumentError("Stdout unsupported on this platform"));
 }
 
+
+void FUNCTION_NAME(Stdout_AnsiSupported)(Dart_NativeArguments args) {
+  Dart_ThrowException(
+      DartUtils::NewDartArgumentError("Stdout unsupported on this platform"));
+}
+
 }  // namespace bin
 }  // namespace dart