Implement WebViewDatabase's hasFormData API for chromium based webview.

components/autofill/browser/webdata/autofill_webdata_service.cc

Index: components/autofill/browser/webdata/autofill_webdata_service.cc
diff --git a/components/autofill/browser/webdata/autofill_webdata_service.cc b/components/autofill/browser/webdata/autofill_webdata_service.cc
index 217f2651e9c105d7b24d829160564ef98e3b3521..1f7e158fe8421f8738099369d84ca7e427f80304 100644
--- a/components/autofill/browser/webdata/autofill_webdata_service.cc
+++ b/components/autofill/browser/webdata/autofill_webdata_service.cc
@@ -72,6 +72,13 @@ WebDataServiceBase::Handle AutofillWebDataService::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,