File system provider.

chrome/common/extensions/api/file_system_provider.idl

Index: chrome/common/extensions/api/file_system_provider.idl
diff --git a/chrome/common/extensions/api/file_system_provider.idl b/chrome/common/extensions/api/file_system_provider.idl
index eb23cd17ed5fd8bfa6955676374c703038a7d40b..6ed44b6d6bebe64ebd15557d70370e8f39f0edb7 100644
--- a/chrome/common/extensions/api/file_system_provider.idl
+++ b/chrome/common/extensions/api/file_system_provider.idl
@@ -12,8 +12,10 @@ namespace fileSystemProvider {
   // system just mounted. <code>fileSystemID</code> is undefined on error.
   // The ID is used to distinguish multiple file systems mounted from a
   // single File System Provider.
-  callback MountCallback = void([instanceOf=DOMError] object error,
-                                DOMString fileSystemId);
+  callback MountCallback = void(DOMString fileSystemId,
+                                [nodoc, instanceOf=DOMError] object error);
+
+  [nocompile] callback ErrorCallback = void([instanceOf=DOMError] object error);
 
   interface Functions {
     // Mounts a file system with the given
@@ -24,6 +26,7 @@ namespace fileSystemProvider {
     // uniquified by adding suffix like "(1)" in the Files.app UI. An empty
     // display name is not allowed.
     static void mount(DOMString displayName,
-                      MountCallback callback);
+                      MountCallback success_callback,
+                      [nocompile] ErrorCallback error_callback);
   };
 };