Give an app the file entries it had back on restart.

chrome/renderer/resources/extensions/app_runtime_custom_bindings.js

 // 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.
 
 // Custom binding for the chrome.app.runtime API.
 
 var binding = require('binding').Binding.create('app.runtime');
 
 var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
 var chrome = requireNative('chrome').GetChrome();
 var fileSystemHelpers = requireNative('file_system_natives');
 var forEach = require('utils').forEach;
 var GetIsolatedFileSystem = fileSystemHelpers.GetIsolatedFileSystem;
 var appNatives = requireNative('app_runtime');
 var DeserializeString = appNatives.DeserializeString;
 var SerializeToString = appNatives.SerializeToString;
 var CreateBlob = appNatives.CreateBlob;
+var entryIdManager = require('entryIdManager');
+
+chromeHidden.Event.registerArgumentMassager('app.runtime.onRestarted',
+    function(args, dispatch) {
+  // These file entries don't get dispatched, we just use this hook to register
+  // them all with entryIdManager.
+  var fileEntries = args[0];
+
+  var pendingCallbacks = fileEntries.length;
+
+  var dispatchIfNoPendingCallbacks = function() {
+    if (pendingCallbacks == 0)
+      dispatch([]);
+  };
+
+  for (var i = 0; i < fileEntries.length; i++) {
+    var fe = fileEntries[i];
+    var fs = GetIsolatedFileSystem(fe.fileSystemId);
+    (function(fe, fs) {

[benwells, 2013/03/13 03:58:29]

Why is this done in an anonymous function?

[koz (OOO until 15th September), 2013/03/13 05:01:13]

Because the var fe, fs above are actually scoped to the outer function(), not
the for loop's body (in JS only function(){} blocks are new scopes), which means
that after every iteration of the loop the fe and fs variables are modified for
all closures they are in.

See
http://stackoverflow.com/questions/1676362/javascript-variable-binding-and-loop

+      fs.root.getFile(fe.baseName, {}, function(fileEntry) {
+        entryIdManager.registerEntry(fe.id, fileEntry);
+        pendingCallbacks--;
+        dispatchIfNoPendingCallbacks();
+      }, function(err) {
+        console.error('Error getting fileEntry, code: ' + err.code);
+        pendingCallbacks--;
+        dispatchIfNoPendingCallbacks();
+      });
+    })(fe, fs);
+  }
+  dispatchIfNoPendingCallbacks();
+});
 
 chromeHidden.Event.registerArgumentMassager('app.runtime.onLaunched',
     function(args, dispatch) {
   var launchData = args[0];
 
   if (launchData && typeof launchData.id !== 'undefined') {
     // new-style dispatch.
     var items = []
     var numItems = launchData.items.length;
     var itemLoaded = function(err, item) {
@@ skipping 20 matching lines @@
       });
     });
   } else if (launchData) {
     dispatch([launchData]);
   } else {
     dispatch([]);
   }
 });
 
 exports.binding = binding.generate();