Optimized webstorage performance

webkit/dom_storage/dom_storage_types.h

Index: webkit/dom_storage/dom_storage_types.h
diff --git a/webkit/dom_storage/dom_storage_types.h b/webkit/dom_storage/dom_storage_types.h
index d2b65bf68724ddb8e13a1549b6ad19dd5a7211c0..46e66f1d63e4e90d998091cd48c2edae955b4405 100644
--- a/webkit/dom_storage/dom_storage_types.h
+++ b/webkit/dom_storage/dom_storage_types.h
@@ -17,6 +17,9 @@ namespace dom_storage {
 // The quota for each storage area. Suggested by the spec.
 const size_t kPerAreaQuota = 5 * 1024 * 1024;
 
+// The threshold we decide to use shared_memory instead of pipe/socket
+const size_t kShmEnableThreshold = 1 * 1024 * 1024;
+
 // Value to indicate the localstorage namespace vs non-zero
 // values for sessionstorage namespaces.
 const int64 kLocalStorageNamespaceId = 0;
@@ -28,6 +31,12 @@ const int kInvalidAreaId = -1;
 
 typedef std::map<string16, NullableString16> ValuesMap;
 
+//
+enum IPC_Flag {
+    Channel = 0,
+    SharedMemory
+};
+
 }  // namespace dom_storage
 
 #endif  // WEBKIT_DOM_STORAGE_DOM_STORAGE_TYPES_H_