[ew] Add basic classes.

chrome/browser/chromeos/file_system_provider/fileapi/backend_delegate.h

Index: chrome/browser/chromeos/file_system_provider/fileapi/backend_delegate.h
diff --git a/chrome/browser/chromeos/file_system_provider/fileapi/backend_delegate.h b/chrome/browser/chromeos/file_system_provider/fileapi/backend_delegate.h
index c4794486888bc1a2d8ab59ab3d8fd590d8b94270..3db30da807885c0c92de5f1cd3f321f54e6d84c6 100644
--- a/chrome/browser/chromeos/file_system_provider/fileapi/backend_delegate.h
+++ b/chrome/browser/chromeos/file_system_provider/fileapi/backend_delegate.h
@@ -6,13 +6,22 @@
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILEAPI_BACKEND_DELEGATE_H_
 
 #include "base/basictypes.h"
+#include "base/file_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chromeos/fileapi/file_system_backend_delegate.h"
 
 namespace fileapi {
 class AsyncFileUtil;
+class FileSystemContext;
+class FileSystemURL;
+class FileStreamWriter;
+class WatcherManager;
 }  // namespace fileapi
 
+namespace webkit_blob {
+class FileStreamReader;
+}  // namespace webkit_blob
+
 namespace chromeos {
 namespace file_system_provider {
 
@@ -35,6 +44,8 @@ class BackendDelegate : public chromeos::FileSystemBackendDelegate {
       const fileapi::FileSystemURL& url,
       int64 offset,
       fileapi::FileSystemContext* context) OVERRIDE;
+  virtual fileapi::WatcherManager* GetWatcherManager(
+      const fileapi::FileSystemURL& url) OVERRIDE;
 
  private:
   scoped_ptr<fileapi::AsyncFileUtil> async_file_util_;