[fsp] Allow to create multiple observers for a directory, up to one per origin.

chrome/browser/chromeos/file_system_provider/fake_provided_file_system.h

Index: chrome/browser/chromeos/file_system_provider/fake_provided_file_system.h
diff --git a/chrome/browser/chromeos/file_system_provider/fake_provided_file_system.h b/chrome/browser/chromeos/file_system_provider/fake_provided_file_system.h
index 52d0ae617b8d7d9ad0deeb53031d815d4b7b7905..b20e3479db4a70dd781ac50a3308f0ea61586eee 100644
--- a/chrome/browser/chromeos/file_system_provider/fake_provided_file_system.h
+++ b/chrome/browser/chromeos/file_system_provider/fake_provided_file_system.h
@@ -18,6 +18,7 @@
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_info.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_observer.h"
+#include "url/gurl.h"
 
 class Profile;
 
@@ -126,10 +127,13 @@ class FakeProvidedFileSystem : public ProvidedFileSystemInterface {
       int length,
       const storage::AsyncFileUtil::StatusCallback& callback) override;
   virtual AbortCallback ObserveDirectory(
+      const GURL& origin,
       const base::FilePath& directory_path,
       bool recursive,
+      bool persistent,
       const storage::AsyncFileUtil::StatusCallback& callback) override;
   virtual void UnobserveEntry(
+      const GURL& origin,
       const base::FilePath& entry_path,
       bool recursive,
       const storage::AsyncFileUtil::StatusCallback& callback) override;