Add OnSyncEnabled/OnWriteEnabled notification handling to operation runner

webkit/fileapi/syncable/local_file_sync_status.h

Index: webkit/fileapi/syncable/local_file_sync_status.h
diff --git a/webkit/fileapi/syncable/local_file_sync_status.h b/webkit/fileapi/syncable/local_file_sync_status.h
index f99b84eaac968ac155926cc11c540128bcd8457d..14f083512d2cf21a3411632a840cbe53e54e2599 100644
--- a/webkit/fileapi/syncable/local_file_sync_status.h
+++ b/webkit/fileapi/syncable/local_file_sync_status.h
@@ -10,6 +10,7 @@
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/observer_list.h"
 #include "base/threading/non_thread_safe.h"
 #include "webkit/fileapi/file_system_url.h"
 
@@ -27,6 +28,15 @@ namespace fileapi {
 // while the target url is in syncing must fail and vice versa.
 class WEBKIT_STORAGE_EXPORT LocalFileSyncStatus : public base::NonThreadSafe {
  public:
+  class Observer {
+   public:
+    Observer() {}
+    virtual void OnSyncEnabled(const FileSystemURL& url) = 0;
+    virtual void OnWriteEnabled(const FileSystemURL& url) = 0;
+   private:
+    DISALLOW_COPY_AND_ASSIGN(Observer);
+  };
+
   LocalFileSyncStatus();
   ~LocalFileSyncStatus();
 
@@ -50,6 +60,9 @@ class WEBKIT_STORAGE_EXPORT LocalFileSyncStatus : public base::NonThreadSafe {
   // Returns true if the |url| is enabled for writing (i.e. not in syncing).
   bool IsWritable(const FileSystemURL& url) const;
 
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
  private:
   typedef std::map<FileSystemURL, int64, FileSystemURL::Comparator> URLCountMap;
   typedef std::set<FileSystemURL, FileSystemURL::Comparator> URLSet;
@@ -63,6 +76,8 @@ class WEBKIT_STORAGE_EXPORT LocalFileSyncStatus : public base::NonThreadSafe {
   // If this flag is set sync process is running on the file.
   URLSet syncing_;
 
+  ObserverList<Observer> observer_list_;
+
   DISALLOW_COPY_AND_ASSIGN(LocalFileSyncStatus);
 };