[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 aa24683cc3fd82e96bff640f5b885dddfeb2fc22..f16bd2a7dba6c1c2f7ae8df3f8cb19a96924de11 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,
       const storage::AsyncFileUtil::StatusCallback& callback) override;
   virtual const ProvidedFileSystemInfo& GetFileSystemInfo() const override;