Reverting 27759.

chrome/browser/in_process_webkit/dom_storage_context.h

Index: chrome/browser/in_process_webkit/dom_storage_context.h
===================================================================
--- chrome/browser/in_process_webkit/dom_storage_context.h	(revision 27849)
+++ chrome/browser/in_process_webkit/dom_storage_context.h	(working copy)
@@ -7,6 +7,7 @@
 
 #include "base/file_path.h"
 #include "base/hash_tables.h"
+#include "chrome/browser/in_process_webkit/dom_storage_dispatcher_host.h"
 
 class StorageArea;
 class StorageNamespace;
@@ -15,7 +16,8 @@
 // This is owned by WebKitContext and is all the dom storage information that's
 // shared by all the ResourceMessageFilter/DOMStorageDispatcherHosts that share
 // the same profile.  The specifics of responsibilities are fairly well
-// documented here and in StorageNamespace and StorageArea.
+// documented here and in StorageNamespace and StorageArea.  Everything is only
+// to be accessed on the WebKit thread unless noted otherwise.
 class DOMStorageContext {
  public:
   explicit DOMStorageContext(WebKitContext* webkit_context);
@@ -44,6 +46,13 @@
   void UnregisterStorageNamespace(StorageNamespace* storage_namespace);
   StorageNamespace* GetStorageNamespace(int64 id);
 
+  // Sometimes an event from one DOM storage dispatcher host requires
+  // communication to all of them.
+  typedef base::hash_set<DOMStorageDispatcherHost*> DispatcherHostSet;
+  void RegisterDispatcherHost(DOMStorageDispatcherHost* dispatcher_host);
+  void UnregisterDispatcherHost(DOMStorageDispatcherHost* dispatcher_host);
+  const DispatcherHostSet* GetDispatcherHostSet() const;
+
   // The special ID used for local storage.
   static const int64 kLocalStorageNamespaceId = 0;
 
@@ -57,6 +66,10 @@
   // We're owned by this WebKit context.  Used while instantiating LocalStorage.
   WebKitContext* webkit_context_;
 
+  // All the DOMStorageDispatcherHosts that are attached to us. ONLY USE ON THE
+  // IO THREAD!
+  DispatcherHostSet dispatcher_host_set_;
+
   // Maps ids to StorageAreas.  We do NOT own these objects.  StorageNamespace
   // (which does own them) will notify us when we should remove the entries.
   typedef base::hash_map<int64, StorageArea*> StorageAreaMap;