Fix secure text entry setting

Summary:
We have password components which allow visibility to be toggled by
setting both the keyboardType and secureTextEntry props. The order in
which those updates are executed is determined by iterating a NativeMap
of props, and the iteration order of a NativeMap is implementation
dependent.

With libc++ as our STL, we observe that setSecureTextEntry is called
before setKeyboardType. This results in the following sequence of input
type flag settings when toggling the component to visible and then back
to hidden:

* The field starts out with TYPE_TEXT_VARIATION_PASSWORD (0x80).
* When we toggle to visible, setSecureTextEntry is called with password
  being false, which clears TYPE_TEXT_VARIATION_PASSWORD.
  setKeyboardType is then called with the visible-password keyboard
  type, which sets TYPE_TEXT_VARIATION_VISIBLE_PASSWORD (0x90).
* When we toggle back to hidden, setSecureTextEntry is called with
  password being true, which sets TYPE_TEXT_VARIATION_PASSWORD but
  doesn't clear TYPE_TEXT_VARIATION_VISIBLE_PASSWORD. setKeyboardType is
  then called with the default keyboard type and additionally sets
  TYPE_CLASS_TEXT, but TYPE_TEXT_VARIATION_VISIBLE_PASSWORD remains and
  the password field remains visible.

The fix is to clear TYPE_TEXT_VARIATION_VISIBLE_PASSWORD when
setSecureTextEntry is called with password being true, to ensure the
password gets hidden.

Changelog:
[Android][Fixed] - Fix secure text entry setting to always hide text

Reviewed By: shergin

Differential Revision: D23399174

fbshipit-source-id: a81deec702e768672e2103b76ab50ec728dac229

Author: smeenai

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

@@ -707,7 +707,7 @@ public void setSecureTextEntry(ReactEditText view, boolean password) {
     updateStagedInputTypeFlag(
         view,
         password
-            ? 0
+            ? InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD
             : InputType.TYPE_NUMBER_VARIATION_PASSWORD | InputType.TYPE_TEXT_VARIATION_PASSWORD,
         password ? InputType.TYPE_TEXT_VARIATION_PASSWORD : 0);
     checkPasswordType(view);