[IndexedDB] Adding transaction and value support to observers

content/browser/indexed_db/indexed_db_transaction_coordinator.cc

Index: content/browser/indexed_db/indexed_db_transaction_coordinator.cc
diff --git a/content/browser/indexed_db/indexed_db_transaction_coordinator.cc b/content/browser/indexed_db/indexed_db_transaction_coordinator.cc
index 68e01728813500240ba1625873519d9073cc87ea..c4c69a2a3c0aa45d6bf66d26d671f7b45d401f27 100644
--- a/content/browser/indexed_db/indexed_db_transaction_coordinator.cc
+++ b/content/browser/indexed_db/indexed_db_transaction_coordinator.cc
@@ -27,6 +27,16 @@ void IndexedDBTransactionCoordinator::DidCreateTransaction(
   ProcessQueuedTransactions();
 }
 
+void IndexedDBTransactionCoordinator::DidCreateObserverTransaction(

[jsbell, 2017/01/13 00:14:12]

Maybe comment here that observer txs jump to the head of the queue?

[dmurph, 2017/01/13 01:50:43]

Done.

+    IndexedDBTransaction* transaction) {
+  DCHECK(!queued_transactions_.count(transaction));
+  DCHECK(!started_transactions_.count(transaction));
+  DCHECK_EQ(IndexedDBTransaction::CREATED, transaction->state());
+
+  started_transactions_.insert_front(transaction);
+  ProcessQueuedTransactions();
+}
+
 void IndexedDBTransactionCoordinator::DidFinishTransaction(
     IndexedDBTransaction* transaction) {
   if (queued_transactions_.count(transaction)) {