Move generated files to gen/.

tool/patch_sdk.dart

Index: tool/patch_sdk.dart
diff --git a/tool/patch_sdk.dart b/tool/patch_sdk.dart
index 14562b14f5c59d4baf7f55fb18968ef2863ed81f..54ac0251f59ca403eb9ca75ea3bf30ad8c0f3511 100755
--- a/tool/patch_sdk.dart
+++ b/tool/patch_sdk.dart
@@ -20,15 +20,11 @@ void main(List<String> argv) {
 
     var inputExample = path.join(toolDir, 'input_sdk');
     var outExample = path.relative(
-        path.normalize(path.join(toolDir, '..', 'test', 'generated_sdk')));
+        path.normalize(path.join('gen', 'patched_sdk')));
 
     print('Usage: $self INPUT_DIR OUTPUT_DIR');
     print('For example:');
     print('\$ $self $inputExample $outExample');
-
-    inputExample = path.join(toolDir, 'min_sdk');
-    outExample = path.join(toolDir, 'out', 'min_sdk');
-    print('\$ $self $inputExample $outExample');
     exit(1);
   }