Webview disable save form prop

Summary:
Adds functionality to be able to disable saving of form data and thereby disabling autocomplete in webview on Android. Can be used as a workaround for #13241

Manual testing that autocomplete is disabled when the property is set to true, and still enabled when it is unset or set to false.
Closes https://github.com/facebook/react-native/pull/13271

Differential Revision: D4858899

Pulled By: ericvicenti

fbshipit-source-id: 62738b0685e4c1958c8a32e184fa2fe4f711b336

Libraries/Components/WebView/WebView.android.js

@@ -184,11 +184,18 @@ class WebView extends React.Component {
       'always',
       'compatibility'
     ]),
+
+    /**
+     * Used on Android only, controls whether form autocomplete data should be saved
+     * @platform android
+     */
+    saveFormDataDisabled: PropTypes.bool,
   };
 
   static defaultProps = {
     javaScriptEnabled : true,
     scalesPageToFit: true,
+    saveFormDataDisabled: false
   };
 
   state = {
@@ -261,6 +268,7 @@ class WebView extends React.Component {
         mediaPlaybackRequiresUserAction={this.props.mediaPlaybackRequiresUserAction}
         allowUniversalAccessFromFileURLs={this.props.allowUniversalAccessFromFileURLs}
         mixedContentMode={this.props.mixedContentMode}
+        saveFormDataDisabled={this.props.saveFormDataDisabled}
       />;
 
     return (

ReactAndroid/src/main/java/com/facebook/react/views/webview/ReactWebViewManager.java

@@ -397,6 +397,11 @@ public class ReactWebViewManager extends SimpleViewManager<WebView> {
   public void setAllowUniversalAccessFromFileURLs(WebView view, boolean allow) {
     view.getSettings().setAllowUniversalAccessFromFileURLs(allow);
   }
+  
+  @ReactProp(name = "saveFormDataDisabled")
+  public void setSaveFormDataDisabled(WebView view, boolean disable) {
+    view.getSettings().setSaveFormData(!disable);
+  }
 
   @ReactProp(name = "injectedJavaScript")
   public void setInjectedJavaScript(WebView view, @Nullable String injectedJavaScript) {