Implement WebViewDatabase's hasFormData API for chromium based webview.

components/autofill/browser/webdata/autofill_webdata_service.h

 // Copyright (c) 2012 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_BROWSER_WEBDATA_AUTOFILL_WEBDATA_SERVICE_H_
 #define COMPONENTS_AUTOFILL_BROWSER_WEBDATA_AUTOFILL_WEBDATA_SERVICE_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
@@ skipping 47 matching lines @@
   virtual void ShutdownOnUIThread() OVERRIDE;
 
   // AutofillWebData implementation.
   virtual void AddFormFields(
       const std::vector<FormFieldData>& fields) OVERRIDE;
   virtual WebDataServiceBase::Handle GetFormValuesForElementName(
       const base::string16& name,
       const base::string16& prefix,
       int limit,
       WebDataServiceConsumer* consumer) OVERRIDE;
+
+  virtual WebDataServiceBase::Handle HasFormElements(
+      WebDataServiceConsumer* consumer) OVERRIDE;
   virtual void RemoveFormElementsAddedBetween(
       const base::Time& delete_begin, const base::Time& delete_end) OVERRIDE;
   virtual void RemoveExpiredFormElements() OVERRIDE;
   virtual void RemoveFormValueForElementName(
       const base::string16& name,
       const base::string16& value) OVERRIDE;
   virtual void AddAutofillProfile(const AutofillProfile& profile) OVERRIDE;
   virtual void UpdateAutofillProfile(const AutofillProfile& profile) OVERRIDE;
   virtual void RemoveAutofillProfile(const std::string& guid) OVERRIDE;
   virtual WebDataServiceBase::Handle GetAutofillProfiles(
@@ skipping 46 matching lines @@
   ObserverList<AutofillWebDataServiceObserverOnUIThread> ui_observer_list_;
 
   scoped_refptr<AutofillWebDataBackend> autofill_backend_;
 
   DISALLOW_COPY_AND_ASSIGN(AutofillWebDataService);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_BROWSER_WEBDATA_AUTOFILL_WEBDATA_SERVICE_H_