rAc: make requestAutocomplete() return a promise.

Source/core/html/HTMLFormElement.h

Index: Source/core/html/HTMLFormElement.h
diff --git a/Source/core/html/HTMLFormElement.h b/Source/core/html/HTMLFormElement.h
index fb7bd5ba012387f76339748f1f1eb3d01149b515..272e998d668e596fecf789bd5b978811c3b30005 100644
--- a/Source/core/html/HTMLFormElement.h
+++ b/Source/core/html/HTMLFormElement.h
@@ -29,6 +29,7 @@
 #include "core/html/forms/RadioButtonGroupScope.h"
 #include "core/loader/FormSubmission.h"
 #include "wtf/OwnPtr.h"
+#include "wtf/RefPtr.h"
 #include "wtf/WeakPtr.h"
 
 namespace WTF{
@@ -37,12 +38,14 @@ class TextEncoding;
 
 namespace WebCore {
 
+class AutocompleteRequest;
 class Event;
 class FormAssociatedElement;
 class FormData;
 class HTMLFormControlElement;
 class HTMLImageElement;
 class HTMLInputElement;
+class ScriptPromise;
 
 class HTMLFormElement FINAL : public HTMLElement {
 public:
@@ -101,7 +104,7 @@ public:
         AutocompleteResultErrorInvalid,
     };
 
-    void requestAutocomplete(const Dictionary&);
+    ScriptPromise requestAutocomplete(const Dictionary&);
     void finishRequestAutocomplete(AutocompleteResult);
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(autocomplete);
@@ -175,9 +178,11 @@ private:
 
     bool m_wasDemoted;
 
+    void doFinishRequestAutocomplete(AutocompleteResult, PassOwnPtr<AutocompleteRequest>);
     void requestAutocompleteTimerFired(Timer<HTMLFormElement>*);
 
-    WillBePersistentHeapVector<RefPtrWillBeMember<Event> > m_pendingAutocompleteEvents;
+    OwnPtr<AutocompleteRequest> m_pendingAutocompleteRequest;
+    Vector<OwnPtr<AutocompleteRequest> > m_finishedAutocompleteRequests;
     Timer<HTMLFormElement> m_requestAutocompleteTimer;
 };