Add support for actions for multiple file selection.

chrome/browser/chromeos/file_system_provider/provided_file_system.h

Index: chrome/browser/chromeos/file_system_provider/provided_file_system.h
diff --git a/chrome/browser/chromeos/file_system_provider/provided_file_system.h b/chrome/browser/chromeos/file_system_provider/provided_file_system.h
index 3aeb727a2209ccf3196518343c068377c66a1e20..253389c63a89dae4334c1ade3b81de0e8b364628 100644
--- a/chrome/browser/chromeos/file_system_provider/provided_file_system.h
+++ b/chrome/browser/chromeos/file_system_provider/provided_file_system.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_H_
 
+#include <set>
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ -95,10 +96,10 @@ class ProvidedFileSystem : public ProvidedFileSystemInterface {
   AbortCallback GetMetadata(const base::FilePath& entry_path,
                             MetadataFieldMask fields,
                             const GetMetadataCallback& callback) override;
-  AbortCallback GetActions(const base::FilePath& entry_path,
+  AbortCallback GetActions(const std::set<base::FilePath>& entry_paths,
                            const GetActionsCallback& callback) override;
   AbortCallback ExecuteAction(
-      const base::FilePath& entry_path,
+      const std::set<base::FilePath>& entry_paths,
       const std::string& action_id,
       const storage::AsyncFileUtil::StatusCallback& callback) override;
   AbortCallback ReadDirectory(