Add obscureText field to TextInputConfiguration (#9908)

Provides a cue to the engine to disable auto-correct/suggest.

packages/flutter/lib/src/services/text_input.dart

@@ -43,15 +43,22 @@ enum TextInputAction {
 class TextInputConfiguration {
   /// Creates configuration information for a text input control.
   ///
-  /// The [inputType] argument must not be null.
+  /// The [inputType] and [obscureText] arguments must not be null.
   const TextInputConfiguration({
     this.inputType: TextInputType.text,
+    this.obscureText: false,
     this.actionLabel,
-  }) : assert(inputType != null);
+  }) : assert(inputType != null),
+       assert(obscureText != null);
 
   /// The type of information for which to optimize the text input control.
   final TextInputType inputType;
 
+  /// Whether to hide the text being edited (e.g., for passwords).
+  ///
+  /// Defaults to false.
+  final bool obscureText;
+
   /// What text to display in the text input control's action button.
   final String actionLabel;
 
@@ -59,6 +66,7 @@ class TextInputConfiguration {
   Map<String, dynamic> toJSON() {
     return <String, dynamic>{
       'inputType': inputType.toString(),
+      'obscureText': obscureText.toString(),
       'actionLabel': actionLabel,
     };
   }

packages/flutter/lib/src/widgets/editable_text.dart

@@ -348,7 +348,7 @@ class EditableTextState extends State<EditableText> implements TextInputClient {
     if (!_hasInputConnection) {
       final TextEditingValue localValue = _value;
       _lastKnownRemoteTextEditingValue = localValue;
-      _textInputConnection = TextInput.attach(this, new TextInputConfiguration(inputType: widget.keyboardType))
+      _textInputConnection = TextInput.attach(this, new TextInputConfiguration(inputType: widget.keyboardType, obscureText: widget.obscureText))
         ..setEditingState(localValue);
     }
     _textInputConnection.show();

packages/flutter/test/services/text_input_test.dart

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/services.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('TextInputConfiguration', () {
+    test('sets expected defaults', () {
+      final TextInputConfiguration configuration = const TextInputConfiguration();
+      expect(configuration.inputType, TextInputType.text);
+      expect(configuration.obscureText, false);
+      expect(configuration.actionLabel, null);
+    });
+
+    test('serializes to JSON', () async {
+      final TextInputConfiguration configuration = const TextInputConfiguration(
+        inputType: TextInputType.number,
+        obscureText: true,
+        actionLabel: 'xyzzy'
+      );
+      final Map<String, dynamic> json = configuration.toJSON();
+      expect(json['inputType'], 'TextInputType.number');
+      expect(json['obscureText'], 'true');
+      expect(json['actionLabel'], 'xyzzy');
+    });
+  });
+}