[IndexedDB] Propogating changes to observers : Renderer

content/browser/indexed_db/indexed_db_transaction.h

Index: content/browser/indexed_db/indexed_db_transaction.h
diff --git a/content/browser/indexed_db/indexed_db_transaction.h b/content/browser/indexed_db/indexed_db_transaction.h
index e889d4389ebb2780278c1a0d38b313dccf8b4ecf..6a579e2e6fdfbe5b6644c598d28743c0356d47e2 100644
--- a/content/browser/indexed_db/indexed_db_transaction.h
+++ b/content/browser/indexed_db/indexed_db_transaction.h
@@ -28,7 +28,9 @@ namespace content {
 class BlobWriteCallbackImpl;
 class IndexedDBCursor;
 class IndexedDBDatabaseCallbacks;
+class IndexedDBObservation;
 class IndexedDBObserver;
+class IndexedDBObserverChanges;
 
 class CONTENT_EXPORT IndexedDBTransaction
     : public NON_EXPORTED_BASE(base::RefCounted<IndexedDBTransaction>) {
@@ -69,6 +71,14 @@ class CONTENT_EXPORT IndexedDBTransaction
   // Delete pending observers with ID's listed in |pending_observer_ids|.
   void RemovePendingObservers(const std::vector<int32_t>& pending_observer_ids);
 
+  // Adds observation for the connection.
+  void AddObservation(int32_t connection_id,
+                      std::unique_ptr<IndexedDBObservation>);
+  // Adds the last observation index to observer_id's list of recorded
+  // observation indices.
+  void RecordObserverForLastObservation(int32_t observer_id,
+                                        int32_t connection_id);
+
   IndexedDBBackingStore::Transaction* BackingStoreTransaction() {
     return transaction_.get();
   }
@@ -144,6 +154,10 @@ class CONTENT_EXPORT IndexedDBTransaction
   // Observers in pending queue do not listen to changes until activated.
   std::vector<std::unique_ptr<IndexedDBObserver>> pending_observers_;
 
+  using ConnectionChangeMap =

[jsbell, 2016/07/11 18:25:33]

Since this type is used in only one place, I wouldn't bother naming it.

[palakj1, 2016/07/11 22:25:40]

Done.

+      std::map<int32_t, std::unique_ptr<IndexedDBObserverChanges>>;
+  ConnectionChangeMap connection_changes_map_;
+
   class TaskQueue {
    public:
     TaskQueue();