[MD Extensions] Respond with a load error when loading unpacked fails

chrome/common/extensions/api/developer_private.idl

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // developerPrivate API.
 // This is a private API exposing developing and debugging functionalities for
 // apps and extensions.
 namespace developerPrivate {
 
   // DEPRECATED: Prefer ExtensionType.
@@ skipping 285 matching lines @@
   dictionary ReloadOptions {
     // If false, an alert dialog will show in the event of a reload error.
     // Defaults to false.
     boolean? failQuietly;
   };
 
   dictionary LoadUnpackedOptions {
     // If false, an alert dialog will show in the event of a reload error.
     // Defaults to false.
     boolean? failQuietly;
+
+    // If true, populates a LoadError for the response rather than setting
+    // lastError.
+    boolean? populateError;
   };
 
   enum PackStatus {
     SUCCESS,
     ERROR,
     WARNING
   };
 
   enum FileType {
     LOAD,
@@ skipping 37 matching lines @@
   dictionary ProjectInfo {
     DOMString name;
   };
 
   dictionary EventData {
     EventType event_type;
     DOMString item_id;
     ExtensionInfo? extensionInfo;
   };
 
+  dictionary ErrorFileSource {
+    // The region before the "highlight" portion.
+    // If the region which threw the error was not found, the full contents of
+    // the file will be in the "beforeHighlight" section.
+    DOMString beforeHighlight;
+
+    // The region of the code which threw the error, and should be highlighted.
+    DOMString highlight;
+
+    // The region after the "highlight" portion.
+    DOMString afterHighlight;
+  };
+
+  dictionary LoadError {
+    // The error that occurred when trying to load the extension.
+    DOMString error;
+
+    // The path to the extension.
+    DOMString path;
+
+    // The file source for the error, if it could be retrieved.
+    ErrorFileSource? source;
+  };
+
   dictionary RequestFileSourceProperties {
     // The ID of the extension owning the file.
     DOMString extensionId;
 
     // The path of the file, relative to the extension; e.g., manifest.json,
     // script.js, or main.html.
     DOMString pathSuffix;
 
     // The error message which was thrown as a result of the error in the file.
     DOMString message;
@@ skipping 64 matching lines @@
   callback ExtensionInfosCallback = void (ExtensionInfo[] result);
   callback ExtensionInfoCallback = void (ExtensionInfo result);
   callback ItemsInfoCallback = void (ItemInfo[] result);
   callback ProfileInfoCallback = void (ProfileInfo info);
   callback GetProjectsInfoCallback = void (ProjectInfo[] result);
   callback PathCallback = void (DOMString path);
   callback PackCallback = void (PackDirectoryResponse response);
   callback VoidCallback = void();
   callback RequestFileSourceCallback =
       void (RequestFileSourceResponse response);
+  callback LoadErrorCallback = void (optional LoadError error);
 
   interface Functions {
     // Runs auto update for extensions and apps immediately.
     // |callback| : Called with the boolean result, true if autoUpdate is
     // successful.
     static void autoUpdate(optional BooleanCallback callback);
 
     // Returns information of all the extensions and apps installed.
     // |options| : Options to restrict the items returned.
     // |callback| : Called with extensions info.
@@ skipping 39 matching lines @@
     // Modifies an extension's current configuration.
     // |update| : The parameters for updating the extension's configuration.
     //     Any properties omitted from |update| will not be changed.
     static void updateExtensionConfiguration(
         ExtensionConfigurationUpdate update,
         optional VoidCallback callback);
 
     // Loads a user-selected unpacked item.
     // |options| : Additional configuration parameters.
     static void loadUnpacked(optional LoadUnpackedOptions options,
-                             optional VoidCallback callback);
+                             optional LoadErrorCallback callback);
 
     // Loads an extension / app.
     // |directory| : The directory to load the extension from.
     static void loadDirectory(
         [instanceOf=DirectoryEntry] object directory,
         PathCallback callback);
 
     // Open Dialog to browse to an entry.
     // |selectType| : Select a file or a folder.
     // |fileType| : Required file type. For example, pem type is for private
@@ skipping 74 matching lines @@
 
   interface Events {
     // Fired when a item state is changed.
     static void onItemStateChanged(EventData response);
 
     // Fired when the profile's state has changed.
     static void onProfileStateChanged(ProfileInfo info);
   };
 
 };