Port messages sent by WebIDBFactoryImpl to Mojo.

third_party/WebKit/Source/modules/indexeddb/IDBRequest.h

Index: third_party/WebKit/Source/modules/indexeddb/IDBRequest.h
diff --git a/third_party/WebKit/Source/modules/indexeddb/IDBRequest.h b/third_party/WebKit/Source/modules/indexeddb/IDBRequest.h
index 0c609debf6f5fe636c41a365e4b04f7070751a25..fde5981aa23177adeec8937882324abb9e4f30da 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBRequest.h
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBRequest.h
@@ -89,6 +89,10 @@ public:
 
     const String& readyState() const;
 
+    // Returns a new WebIDBCallbacks for this request. Must only be called once.
+    std::unique_ptr<WebIDBCallbacks> createWebCallbacks();
+    void webCallbacksDestroyed();
+
     DEFINE_ATTRIBUTE_EVENT_LISTENER(success);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(error);
 
@@ -115,7 +119,7 @@ public:
     bool hasPendingActivity() const final;
 
     // ActiveDOMObject
-    void stop() final;
+    void stop() override;
 
     // EventTarget
     const AtomicString& interfaceName() const override;
@@ -171,6 +175,10 @@ private:
     bool m_didFireUpgradeNeededEvent = false;
     bool m_preventPropagation = false;
     bool m_resultDirty = true;
+
+    // Pointer back to the WebIDBCallbacks that holds a persistent reference to
+    // this object.
+    WebIDBCallbacks* m_webCallbacks = nullptr;
 };
 
 } // namespace blink