Port messages sent by WebIDBFactoryImpl to Mojo.

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

Index: third_party/WebKit/Source/modules/indexeddb/IDBDatabaseCallbacks.h
diff --git a/third_party/WebKit/Source/modules/indexeddb/IDBDatabaseCallbacks.h b/third_party/WebKit/Source/modules/indexeddb/IDBDatabaseCallbacks.h
index 58cfde86e844803eae21e0efd4fffec112430f81..7a6efd1998e7e68fdcd575ae6ffaa4d081b783ea 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBDatabaseCallbacks.h
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBDatabaseCallbacks.h
@@ -34,6 +34,7 @@ namespace blink {
 
 class DOMException;
 class IDBDatabase;
+class WebIDBDatabaseCallbacks;
 
 class MODULES_EXPORT IDBDatabaseCallbacks : public GarbageCollectedFinalized<IDBDatabaseCallbacks> {
 public:
@@ -50,6 +51,12 @@ public:
 
     void connect(IDBDatabase*);
 
+    // Returns a new WebIDBDatabaseCallbacks for this object. Must only be
+    // called once.
+    std::unique_ptr<WebIDBDatabaseCallbacks> createWebCallbacks();
+    void detachWebCallbacks();
+    void webCallbacksDestroyed();
+
 protected:
     // Exposed to subclasses for unit tests.
     IDBDatabaseCallbacks();
@@ -63,6 +70,10 @@ private:
     // can survive too. m_database should be a weak reference to avoid that an
     // IDBDatabase survives the GC with the IDBDatabaseCallbacks.
     WeakMember<IDBDatabase> m_database;
+
+    // Pointer back to the WebIDBDatabaseCallbacks that holds a persistent
+    // reference to this object.
+    WebIDBDatabaseCallbacks* m_webCallbacks = nullptr;
 };
 
 } // namespace blink