[ew] Add basic classes.

chrome/browser/chromeos/fileapi/file_system_backend_delegate.h

Index: chrome/browser/chromeos/fileapi/file_system_backend_delegate.h
diff --git a/chrome/browser/chromeos/fileapi/file_system_backend_delegate.h b/chrome/browser/chromeos/fileapi/file_system_backend_delegate.h
index 5fcda496c73ae43fb0bfb977aee77488648aef04..8cc6df6cca5abd2febc7b520850d095d8c9468e0 100644
--- a/chrome/browser/chromeos/fileapi/file_system_backend_delegate.h
+++ b/chrome/browser/chromeos/fileapi/file_system_backend_delegate.h
@@ -15,9 +15,10 @@ class Time;
 
 namespace fileapi {
 class AsyncFileUtil;
+class FileStreamWriter;
 class FileSystemContext;
 class FileSystemURL;
-class FileStreamWriter;
+class WatcherManager;
 }  // namespace fileapi
 
 namespace webkit_blob {
@@ -27,7 +28,7 @@ class FileStreamReader;
 namespace chromeos {
 
 // This is delegate interface to inject the implementation of the some methods
-// of FileSystemBackend. The main goal is to inject Drive File System.
+// of FileSystemBackend.
 class FileSystemBackendDelegate {
  public:
   virtual ~FileSystemBackendDelegate() {}
@@ -48,6 +49,11 @@ class FileSystemBackendDelegate {
       const fileapi::FileSystemURL& url,
       int64 offset,
       fileapi::FileSystemContext* context) = 0;
+
+  // Called from the FileSystemWatcherService class. The returned pointer must
+  // stay valid until shutdown.
+  virtual fileapi::WatcherManager* GetWatcherManager(
+      const fileapi::FileSystemURL& url) = 0;
 };
 
 }  // namespace chromeos