Proposal: Provide the ability to monitor the usage of origins

webkit/browser/quota/quota_manager.h

Index: webkit/browser/quota/quota_manager.h
diff --git a/webkit/browser/quota/quota_manager.h b/webkit/browser/quota/quota_manager.h
index a6eeb837ac630108234fddbf08fe40b7f637b222..9dced1964e9c13208ce07ef6cd6baddade6c8005 100644
--- a/webkit/browser/quota/quota_manager.h
+++ b/webkit/browser/quota/quota_manager.h
@@ -25,6 +25,7 @@
 #include "webkit/browser/quota/quota_database.h"
 #include "webkit/browser/quota/quota_task.h"
 #include "webkit/browser/quota/special_storage_policy.h"
+#include "webkit/browser/quota/storage_observer.h"
 #include "webkit/browser/webkit_storage_browser_export.h"
 
 namespace base {
@@ -225,6 +226,11 @@ class WEBKIT_STORAGE_BROWSER_EXPORT QuotaManager
 
   bool ResetUsageTracker(StorageType type);
 
+  // Used to register/deregister observers that wish to monitor storage events.
+  void AddStorageObserver(const StorageObserver::MonitorParams& params,

[tmdiep, 2014/03/17 06:27:08]

If we need the ability to update the params for an observer, we can rename this
function and have it perform both add and update.

[nhiroki, 2014/03/17 06:51:40]

From the viewpoint of the Quota spec, I think we don't need the ability because
StorageWatcher is immutable.

+                          StorageObserver* observer);
+  void RemoveStorageObserver(StorageObserver* observer);
+
   // Determines the portion of the temp pool that can be
   // utilized by a single host (ie. 5 for 20%).
   static const int kPerHostTemporaryPortion;