Add upstream bits necessary for iOS card unmask prompt.

components/autofill/ios/browser/js_autofill_manager.h

 // Copyright 2013 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.
 
 #ifndef COMPONENTS_AUTOFILL_IOS_BROWSER_JS_AUTOFILL_MANAGER_H_
 #define COMPONENTS_AUTOFILL_IOS_BROWSER_JS_AUTOFILL_MANAGER_H_
 
 #include "base/ios/block_types.h"
 #include "components/autofill/core/common/autofill_constants.h"
 #import "ios/web/public/web_state/js/crw_js_injection_manager.h"
 
 @class CRWJSInjectionReceiver;
 
 // Loads the JavaScript file, autofill_controller.js, which contains form
 // parsing and autofill functions.
 @interface JsAutofillManager : CRWJSInjectionManager
 
 // Extracts forms from a web page. Only forms with at least |requiredFields|
 // fields and the appropriate attribute requirements are extracted.
 // |completionHandler| is called with the JSON string of forms of a web page.
 // |completionHandler| cannot be nil.
 - (void)fetchFormsWithRequirements:(autofill::RequirementsMask)requirements
         minimumRequiredFieldsCount:(NSUInteger)requiredFieldsCount
                  completionHandler:(void (^)(NSString*))completionHandler;
 
+// Stores the current active element. This is used to make the element active
+// again in case the web view loses focus when a dialog is presented over it.
+- (void)storeActiveElement;
+
+// Clears the current active element.
+- (void)clearActiveElement;
+
 // Fills the data in JSON string |dataString| into the active form field, then
-// executes the |completionHandler|.
+// executes the |completionHandler|. The active form field is either
+// document.activeElement or the field stored by a call to storeActiveElement.
+// non-null.
 - (void)fillActiveFormField:(NSString*)dataString
           completionHandler:(ProceduralBlock)completionHandler;
 
 // Fills a number of fields in the same named form.
 // |completionHandler| is called after the forms are filled. |completionHandler|
 // cannot be nil.
 - (void)fillForm:(NSString*)dataString
     completionHandler:(ProceduralBlock)completionHandler;
 
 // Dispatches the autocomplete event to the form element with the given
 // |formName|.
 - (void)dispatchAutocompleteEvent:(NSString*)formName;
 
 // Dispatches the autocomplete error event to the form element with the given
 // |formName|, supplying the given reason.
 - (void)dispatchAutocompleteErrorEvent:(NSString*)formName
                             withReason:(NSString*)reason;
 
 // Marks up the form with autofill field prediction data (diagnostic tool).
 - (void)fillPredictionData:(NSString*)dataString;
 
 @end
 
 #endif  // COMPONENTS_AUTOFILL_IOS_BROWSER_JS_AUTOFILL_MANAGER_H_