Implement WebViewDatabase's hasFormData API for chromium based webview.

components/autofill/browser/webdata/autofill_webdata_service.cc

 // 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.
 
 #include "components/autofill/browser/webdata/autofill_webdata_service.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "components/autofill/browser/autofill_country.h"
 #include "components/autofill/browser/autofill_profile.h"
@@ skipping 54 matching lines @@
 }
 
 WebDataServiceBase::Handle AutofillWebDataService::GetFormValuesForElementName(
     const base::string16& name, const base::string16& prefix, int limit,
     WebDataServiceConsumer* consumer) {
   return wdbs_->ScheduleDBTaskWithResult(FROM_HERE,
       Bind(&AutofillWebDataBackend::GetFormValuesForElementName,
            autofill_backend_, name, prefix, limit), consumer);
 }
 
+WebDataServiceBase::Handle AutofillWebDataService::HasFormElements(
+    WebDataServiceConsumer* consumer) {
+  return wdbs_->ScheduleDBTaskWithResult(FROM_HERE,
+      Bind(&AutofillWebDataBackend::HasFormElements, autofill_backend_),
+      consumer);
+}
+
 void AutofillWebDataService::RemoveFormElementsAddedBetween(
     const Time& delete_begin, const Time& delete_end) {
   wdbs_->ScheduleDBTask(FROM_HERE,
       Bind(&AutofillWebDataBackend::RemoveFormElementsAddedBetween,
            autofill_backend_, delete_begin, delete_end));
 }
 
 void AutofillWebDataService::RemoveExpiredFormElements() {
   wdbs_->ScheduleDBTask(FROM_HERE,
       Bind(&AutofillWebDataBackend::RemoveExpiredFormElements,
@@ skipping 115 matching lines @@
 }
 
 void AutofillWebDataService::NotifyAutofillMultipleChangedOnUIThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   FOR_EACH_OBSERVER(AutofillWebDataServiceObserverOnUIThread,
                     ui_observer_list_,
                     AutofillMultipleChanged());
 }
 
 }  // namespace autofill