fix ddc build, adds some unsupported methods to dart:io

pkg/dev_compiler/tool/input_sdk/patch/io_patch.dart

Index: pkg/dev_compiler/tool/input_sdk/patch/io_patch.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/patch/io_patch.dart b/pkg/dev_compiler/tool/input_sdk/patch/io_patch.dart
index 1a532de05b8a170b812a6b3997358bdf742adb51..8e72f3231b3aed7e481efa1be799acd33c6d42d4 100644
--- a/pkg/dev_compiler/tool/input_sdk/patch/io_patch.dart
+++ b/pkg/dev_compiler/tool/input_sdk/patch/io_patch.dart
@@ -550,6 +550,11 @@ class Stdin {
   void set lineMode(bool enabled) {
     throw new UnsupportedError("Stdin.lineMode");
   }
+
+  @patch
+  bool get supportsAnsiEscapes {
+    throw new UnsupportedError("Stdin.supportsAnsiEscapes");
+  }
 }
 
 @patch
@@ -568,6 +573,11 @@ class Stdout {
   int _terminalLines(int fd) {
     throw new UnsupportedError("Stdout.terminalLines");
   }
+
+  @patch
+  static bool _supportsAnsiEscapes(int fd) {
+    throw new UnsupportedError("Stdout.supportsAnsiEscapes");
+  }
 }
 
 @patch