SyncFS: Introduce SyncFileSystemBackend

chrome/browser/chromeos/fileapi/cros_mount_point_provider.h

Index: chrome/browser/chromeos/fileapi/cros_mount_point_provider.h
diff --git a/chrome/browser/chromeos/fileapi/cros_mount_point_provider.h b/chrome/browser/chromeos/fileapi/cros_mount_point_provider.h
index 01d8891cad488f1f90577d408337aa41b0c24654..ea8289531781d148d8f1b73d00b1b3888e7c336f 100644
--- a/chrome/browser/chromeos/fileapi/cros_mount_point_provider.h
+++ b/chrome/browser/chromeos/fileapi/cros_mount_point_provider.h
@@ -91,6 +91,8 @@ class CrosMountPointProvider
 
   // fileapi::FileSystemMountPointProvider overrides.
   virtual bool CanHandleType(fileapi::FileSystemType type) const OVERRIDE;
+  virtual GURL GetRootURI(const GURL& origin_url,
+                          fileapi::FileSystemType type) const OVERRIDE;
   virtual void OpenFileSystem(
       const GURL& origin_url,
       fileapi::FileSystemType type,
@@ -118,6 +120,8 @@ class CrosMountPointProvider
       int64 offset,
       fileapi::FileSystemContext* context) const OVERRIDE;
   virtual fileapi::FileSystemQuotaUtil* GetQuotaUtil() OVERRIDE;
+  virtual const fileapi::UpdateObserverList* GetUpdateObservers(
+      fileapi::FileSystemType type) const OVERRIDE;
 
   // fileapi::ExternalFileSystemMountPointProvider overrides.
   virtual bool IsAccessAllowed(const fileapi::FileSystemURL& url)