Add skeleton code to wire Local- and Remote- file sync services

chrome/browser/sync_file_system/sync_file_system_service.h

Index: chrome/browser/sync_file_system/sync_file_system_service.h
diff --git a/chrome/browser/sync_file_system/sync_file_system_service.h b/chrome/browser/sync_file_system/sync_file_system_service.h
index 61918cf631b7c710c4183b925e8cca2139b8584b..650be95e175f8dbccfc8eeede38fb798ffc91a7d 100644
--- a/chrome/browser/sync_file_system/sync_file_system_service.h
+++ b/chrome/browser/sync_file_system/sync_file_system_service.h
@@ -13,6 +13,7 @@
 #include "base/memory/singleton.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
+#include "chrome/browser/sync_file_system/change_observer_interface.h"
 #include "webkit/fileapi/syncable/sync_status_code.h"
 
 class GURL;
@@ -24,8 +25,13 @@ class FileSystemContext;
 namespace sync_file_system {
 
 class LocalFileSyncService;
+class LocalChangeObserver;
+class RemoteChangeObserver;
 
-class SyncFileSystemService : public ProfileKeyedService {
+class SyncFileSystemService
+    : public ProfileKeyedService,
+      public LocalChangeObserver,
+      public RemoteChangeObserver {
  public:
   typedef base::Callback<void(fileapi::SyncStatusCode status)> StatusCallback;
 
@@ -46,8 +52,17 @@ class SyncFileSystemService : public ProfileKeyedService {
 
   void Initialize(scoped_ptr<LocalFileSyncService> local_file_service);
 
+  // RemoteChangeObserver overrides.
+  virtual void OnLocalChangeAvailable(int64 pending_changes) OVERRIDE;
+
+  // LocalChangeObserver overrides.
+  virtual void OnRemoteChangeAvailable(int64 pending_changes) OVERRIDE;
+
   Profile* profile_;
 
+  int64 pending_local_changes_;
+  int64 pending_remote_changes_;
+
   scoped_ptr<LocalFileSyncService> local_file_service_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncFileSystemService);