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 51ce68611f6c221131568ea95cf51c8a18998b7f..22dfba1e782507821d6a69816eba735260ebbdae 100644
--- a/components/autofill/browser/webdata/autofill_webdata_service.cc
+++ b/components/autofill/browser/webdata/autofill_webdata_service.cc
@@ -61,6 +61,12 @@ WebDataServiceBase::Handle AutofillWebDataService::GetFormValuesForElementName(
            this, name, prefix, limit), consumer);
 }
 
+WebDataServiceBase::Handle AutofillWebDataService::HasFormElements(
+    WebDataServiceConsumer* consumer) {
+  return wdbs_->ScheduleDBTaskWithResult(FROM_HERE,
+      Bind(&AutofillWebDataService::HasFormElementsImpl, this), consumer);
+}
+
 void AutofillWebDataService::RemoveFormElementsAddedBetween(
     const Time& delete_begin, const Time& delete_end) {
   wdbs_->ScheduleDBTask(FROM_HERE,
@@ -212,6 +218,14 @@ AutofillWebDataService::GetFormValuesForElementNameImpl(
                                                  values));
 }
 
+scoped_ptr<WDTypedResult> AutofillWebDataService::HasFormElementsImpl(
+    WebDatabase* db) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::DB));
+  bool value = AutofillTable::FromWebDatabase(db)->HasFormElements();
+  return scoped_ptr<WDTypedResult>(
+      new WDResult<bool>(AUTOFILL_VALUE_RESULT, value));
+}
+
 WebDatabase::State AutofillWebDataService::RemoveFormElementsAddedBetweenImpl(
     const base::Time& delete_begin, const base::Time& delete_end,
     WebDatabase* db) {