Add the boilerplate for actions to File System Provider API.

chrome/common/extensions/api/file_system_provider_internal.idl

Index: chrome/common/extensions/api/file_system_provider_internal.idl
diff --git a/chrome/common/extensions/api/file_system_provider_internal.idl b/chrome/common/extensions/api/file_system_provider_internal.idl
index e973e4aa06c8bb947107dc5f7e8b1fd6c7ea1fa5..af3db413d206e6be0ee4c1796a12d66d585d5981 100644
--- a/chrome/common/extensions/api/file_system_provider_internal.idl
+++ b/chrome/common/extensions/api/file_system_provider_internal.idl
@@ -22,6 +22,14 @@ namespace fileSystemProviderInternal {
         fileSystemProvider.EntryMetadata metadata,
         long executionTime);
 
+    // Internal. Success callback of the <code>onGetActionsRequested</code>
+    // event. Must be called if actions are available.
+    static void getActionsRequestedSuccess(
+        DOMString fileSystemId,
+        long requestId,
+        fileSystemProvider.Action[] actions,
+        long executionTime);
+
     // Internal. Success callback of the <code>onReadDirectoryRequested</code>
     // event. Can be called multiple times per request.
     static void readDirectoryRequestedSuccess(