Purge in-memory localStorage areas if the # of areas exceeds the limit

content/browser/dom_storage/dom_storage_message_filter.cc

Index: content/browser/dom_storage/dom_storage_message_filter.cc
diff --git a/content/browser/dom_storage/dom_storage_message_filter.cc b/content/browser/dom_storage/dom_storage_message_filter.cc
index 9479cc9ae1e1e5c39a73d44eaa66db75b840ccbc..96606d8537a8e9fd39a170299ff875ae0bb2a1d9 100644
--- a/content/browser/dom_storage/dom_storage_message_filter.cc
+++ b/content/browser/dom_storage/dom_storage_message_filter.cc
@@ -6,6 +6,7 @@
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
+#include "base/stringprintf.h"
 #include "base/nullable_string16.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/utf_string_conversions.h"
@@ -95,12 +96,14 @@ bool DOMStorageMessageFilter::OnMessageReceived(const IPC::Message& message,
 
 void DOMStorageMessageFilter::OnOpenStorageArea(int connection_id,
                                                 int64 namespace_id,
-                                                const GURL& origin) {
+                                                const GURL& origin,
+                                                int64* storage_size) {
   DCHECK(!BrowserThread::CurrentlyOn(BrowserThread::IO));
   if (!host_->OpenStorageArea(connection_id, namespace_id, origin)) {
     RecordAction(UserMetricsAction("BadMessageTerminate_DSMF_1"));
     BadMessageReceived();
   }
+  *storage_size = context_->GetInMemoryStorageSize();
 }
 
 void DOMStorageMessageFilter::OnCloseStorageArea(int connection_id) {
@@ -208,6 +211,7 @@ void DOMStorageMessageFilter::SendDomStorageEvent(
     params.new_value = new_value;
     params.old_value = old_value;
     params.namespace_id = area->namespace_id();
+    params.storage_size = context_->GetInMemoryStorageSize();
     Send(new DOMStorageMsg_Event(params));
   }
 }