[Quota] Add UsageTracker::GetGlobalLimitedUsage

webkit/quota/usage_tracker.cc

Index: webkit/quota/usage_tracker.cc
diff --git a/webkit/quota/usage_tracker.cc b/webkit/quota/usage_tracker.cc
index 1cc72052e81430c966706361dd3fb5c8b27ec36e..54d98a537fc0a0d2ec269641fa64a4fcc2d8a93f 100644
--- a/webkit/quota/usage_tracker.cc
+++ b/webkit/quota/usage_tracker.cc
@@ -60,6 +60,12 @@ bool OriginSetContainsOrigin(const OriginSetByHost& origins,
   return itr != origins.end() && ContainsKey(itr->second, origin);
 }
 
+void DidGetGlobalUsageForLimitedGlobalUsage(const UsageCallback& callback,
+                                            int64 total_global_usage,
+                                            int64 global_unlimited_usage) {
+  callback.Run(total_global_usage - global_unlimited_usage);
+}
+
 }  // namespace
 
 // UsageTracker ----------------------------------------------------------
@@ -88,6 +94,10 @@ ClientUsageTracker* UsageTracker::GetClientTracker(QuotaClient::ID client_id) {
   return NULL;
 }
 
+void UsageTracker::GetGlobalLimitedUsage(const UsageCallback& callback) {
+  GetGlobalUsage(base::Bind(&DidGetGlobalUsageForLimitedGlobalUsage, callback));
+}
+
 void UsageTracker::GetGlobalUsage(const GlobalUsageCallback& callback) {
   if (!global_usage_callbacks_.Add(callback))
     return;