Add visible-password for TextInput.keyboardType on Android

Summary:
`visible-password` represents a very basic keyboard, typically only
letters and numbers.  Backed by InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD,
it is useful for things like password and code entry fields. It can also be more
effective than autoCorrect={false} for disabling autocompletion on some keyboards
(like Gboard).

Note `secureTextEntry` also affects `TYPE_TEXT_VARIATION_*` flags internally, so there
may be some undefined behavior when combining `secureTextEntry` with
`keyboardType="visible-password"`

Also, while here, improve the documentation on TextInput to explicitly enumerate
which keyboardType applies to Android vs. iOS (since this is the first android-specific)

Reviewed By: shergin

Differential Revision: D6005353

fbshipit-source-id: 13af90c96353f714c0e106dd0fde90184a476533

Libraries/Components/TextInput/TextInput.js

@@ -245,6 +245,25 @@ const TextInput = createReactClass({
      * - `numeric`
      * - `email-address`
      * - `phone-pad`
+     *
+     * *iOS Only*
+     *
+     * The following values work on iOS only:
+     *
+     * - `ascii-capable`
+     * - `numbers-and-punctuation`
+     * - `url`
+     * - `number-pad`
+     * - `name-phone-pad`
+     * - `decimal-pad`
+     * - `twitter`
+     * - `web-search`
+     *
+     * *Android Only*
+     *
+     * The following values work on Android only:
+     *
+     * - `visible-password`
      */
     keyboardType: PropTypes.oneOf([
       // Cross-platform
@@ -261,6 +280,8 @@ const TextInput = createReactClass({
       'decimal-pad',
       'twitter',
       'web-search',
+      // Android-only
+      'visible-password',
     ]),
     /**
      * Determines the color of the keyboard.

ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactTextInputManager.java

@@ -77,6 +77,7 @@ public class ReactTextInputManager extends BaseViewManager<ReactEditText, Layout
   private static final String KEYBOARD_TYPE_EMAIL_ADDRESS = "email-address";
   private static final String KEYBOARD_TYPE_NUMERIC = "numeric";
   private static final String KEYBOARD_TYPE_PHONE_PAD = "phone-pad";
+  private static final String KEYBOARD_TYPE_VISIBLE_PASSWORD = "visible-password";
   private static final InputFilter[] EMPTY_FILTERS = new InputFilter[0];
   private static final int UNSET = -1;
 
@@ -528,6 +529,8 @@ public class ReactTextInputManager extends BaseViewManager<ReactEditText, Layout
       flagsToSet = InputType.TYPE_TEXT_VARIATION_EMAIL_ADDRESS | InputType.TYPE_CLASS_TEXT;
     } else if (KEYBOARD_TYPE_PHONE_PAD.equalsIgnoreCase(keyboardType)) {
       flagsToSet = InputType.TYPE_CLASS_PHONE;
+    } else if (KEYBOARD_TYPE_VISIBLE_PASSWORD.equalsIgnoreCase(keyboardType)) {
+      flagsToSet = InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD;
     }
     updateStagedInputTypeFlag(
         view,