IDBObserver: Lifetime Management: Adding Observer

content/child/indexed_db/indexed_db_dispatcher.h

Index: content/child/indexed_db/indexed_db_dispatcher.h
diff --git a/content/child/indexed_db/indexed_db_dispatcher.h b/content/child/indexed_db/indexed_db_dispatcher.h
index 9e5068db7b6f12e14a3ef48bc722d0bcdf3e2093..2f9905b30d61f3b7a3df565a378d96214c285402 100644
--- a/content/child/indexed_db/indexed_db_dispatcher.h
+++ b/content/child/indexed_db/indexed_db_dispatcher.h
@@ -24,6 +24,7 @@
 #include "third_party/WebKit/public/platform/WebBlobInfo.h"
 #include "third_party/WebKit/public/platform/modules/indexeddb/WebIDBCallbacks.h"
 #include "third_party/WebKit/public/platform/modules/indexeddb/WebIDBDatabaseCallbacks.h"
+#include "third_party/WebKit/public/platform/modules/indexeddb/WebIDBObserver.h"
 #include "third_party/WebKit/public/platform/modules/indexeddb/WebIDBTypes.h"
 #include "url/origin.h"
 
@@ -74,6 +75,16 @@ class CONTENT_EXPORT IndexedDBDispatcher : public WorkerThread::Observer {
   // This method is virtual so it can be overridden in unit tests.
   virtual bool Send(IPC::Message* msg);
 
+  int32_t AddIDBObserver(int32_t ipc_database_id,
+                         int64_t transaction_id,
+                         std::unique_ptr<blink::WebIDBObserver> observer);
+  std::vector<int32_t> RemoveIDBObserversFromDatabase(
+      int32_t ipc_database_id,
+      std::unique_ptr<blink::WebIDBObserver> observer,
+      const std::vector<int32_t>& database_observer_ids);
+  // Removes observers  from map observers_ . No IPC message generated.
+  void RemoveIDBObservers(const std::vector<int32_t>& observer_ids_to_remove);
+
   void RequestIDBFactoryGetDatabaseNames(blink::WebIDBCallbacks* callbacks,
                                          const url::Origin& origin);
 
@@ -258,12 +269,12 @@ class CONTENT_EXPORT IndexedDBDispatcher : public WorkerThread::Observer {
   // Used by unit tests to exercise behavior without allocating huge chunks
   // of memory.
   size_t max_put_value_size_ = kMaxIDBMessageSizeInBytes;
-
   // Careful! WebIDBCallbacks wraps non-threadsafe data types. It must be
   // destroyed and used on the same thread it was created on.
   IDMap<blink::WebIDBCallbacks, IDMapOwnPointer> pending_callbacks_;
   IDMap<blink::WebIDBDatabaseCallbacks, IDMapOwnPointer>
       pending_database_callbacks_;
+  IDMap<blink::WebIDBObserver, IDMapOwnPointer> observers_;
 
   // Maps the ipc_callback_id from an open cursor request to the request's
   // transaction_id. Used to assign the transaction_id to the WebIDBCursorImpl
@@ -272,7 +283,6 @@ class CONTENT_EXPORT IndexedDBDispatcher : public WorkerThread::Observer {
 
   // Map from cursor id to WebIDBCursorImpl.
   std::map<int32_t, WebIDBCursorImpl*> cursors_;
-
   std::map<int32_t, WebIDBDatabaseImpl*> databases_;
 
   DISALLOW_COPY_AND_ASSIGN(IndexedDBDispatcher);