iOS full-form Autofill: Handle partially filled forms correctly.

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"
@@ skipping 29 matching lines @@
 - (void)clearActiveElement;
 
 // Fills the data in JSON string |dataString| into the active form field, then
 // 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.
+// If |onlyFillEmpty| is true then only empty fields will be filled. Otherwise
+// all fields will be filled.
+// Field named |forceFillFieldName| will always be filled, regardless of value
+// of |onlyFillEmpty|. May be null.
 // Applies Autofill CSS (i.e. yellow background) to filled elements if
 // |styleElements| is true.
 // |completionHandler| is called after the forms are filled. |completionHandler|
 // cannot be nil.
 - (void)fillForm:(NSString*)dataString
-        styleElements:(BOOL)styleElements
-    completionHandler:(ProceduralBlock)completionHandler;
+         onlyFillEmpty:(BOOL)onlyFillEmpty
+    forceFillFieldName:(NSString*)forceFillFieldName
+         styleElements:(BOOL)styleElements
+     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_