IndexedDB: Cursor pre-fetching.

content/browser/in_process_webkit/indexed_db_dispatcher_host.cc

Index: content/browser/in_process_webkit/indexed_db_dispatcher_host.cc
diff --git a/content/browser/in_process_webkit/indexed_db_dispatcher_host.cc b/content/browser/in_process_webkit/indexed_db_dispatcher_host.cc
index e4abb511610c1b7d11ceb143b09144dc576c387c..f52166702e9b84dea736622af55b3359d7184fcd 100644
--- a/content/browser/in_process_webkit/indexed_db_dispatcher_host.cc
+++ b/content/browser/in_process_webkit/indexed_db_dispatcher_host.cc
@@ -886,6 +886,8 @@ bool IndexedDBDispatcherHost::CursorDispatcherHost::OnMessageReceived(
     IPC_MESSAGE_HANDLER(IndexedDBHostMsg_CursorDirection, OnDirection)
     IPC_MESSAGE_HANDLER(IndexedDBHostMsg_CursorUpdate, OnUpdate)
     IPC_MESSAGE_HANDLER(IndexedDBHostMsg_CursorContinue, OnContinue)
+    IPC_MESSAGE_HANDLER(IndexedDBHostMsg_CursorPrefetch, OnPrefetch)
+    IPC_MESSAGE_HANDLER(IndexedDBHostMsg_CursorPrefetchReset, OnPrefetchReset)
     IPC_MESSAGE_HANDLER(IndexedDBHostMsg_CursorDelete, OnDelete)
     IPC_MESSAGE_HANDLER(IndexedDBHostMsg_CursorDestroyed, OnDestroyed)
     IPC_MESSAGE_UNHANDLED(handled = false)
@@ -967,6 +969,32 @@ void IndexedDBDispatcherHost::CursorDispatcherHost::OnContinue(
                                                 cursor_id), *ec);
 }
 
+void IndexedDBDispatcherHost::CursorDispatcherHost::OnPrefetch(
+    int32 cursor_id,
+    int32 response_id,
+    int n,
+    WebKit::WebExceptionCode* ec) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::WEBKIT));
+  WebIDBCursor* idb_cursor = parent_->GetOrTerminateProcess(&map_, cursor_id);
+  if (!idb_cursor)
+    return;
+
+  *ec = 0;
+  idb_cursor->prefetchContinue(
+      n, new IndexedDBCallbacks<WebIDBCursor>(parent_, response_id,
+                                              cursor_id), *ec);
+}
+
+void IndexedDBDispatcherHost::CursorDispatcherHost::OnPrefetchReset(
+    int32 cursor_id, int used_prefetches, int unused_prefetches) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::WEBKIT));
+  WebIDBCursor* idb_cursor = parent_->GetOrTerminateProcess(&map_, cursor_id);
+  if (!idb_cursor)
+    return;
+
+  idb_cursor->prefetchReset(used_prefetches, unused_prefetches);
+}
+
 void IndexedDBDispatcherHost::CursorDispatcherHost::OnDelete(
     int32 cursor_id,
     int32 response_id,