Hook up import history to media scanner.

ui/file_manager/file_manager/background/js/test_import_history.js

Index: ui/file_manager/file_manager/background/js/test_import_history.js
diff --git a/ui/file_manager/file_manager/background/js/test_import_history.js b/ui/file_manager/file_manager/background/js/test_import_history.js
new file mode 100644
index 0000000000000000000000000000000000000000..f23962e71e9cc23ca7da2862881a56c4d871030b
--- /dev/null
+++ b/ui/file_manager/file_manager/background/js/test_import_history.js
@@ -0,0 +1,56 @@
+// Copyright 2014 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.
+
+// Namespace
+var importer = importer || {};
+
+/**
+ * importer.ImportHistory and importer.HistoryLoader test double.
+ * ONE STOP SHOPPING!
+ *
+ * @constructor
+ * @struct
+ * @implements {importer.HistoryLoader}
+ * @implements {importer.ImportHistory}
+ */
+importer.TestImportHistory = function() {
+  /**
+   * List of paths that should be considered imported.
+   * @type {!Array.<string>}
+   */
+  this.importedPaths = {};
+};
+
+/** @override */
+importer.TestImportHistory.prototype.getHistory =
+    function() {
+  return Promise.resolve(this);
+};
+
+/** @override */
+importer.TestImportHistory.prototype.wasImported =
+    function(entry, destination) {
+  var path = entry.fullPath;
+  return Promise.resolve(
+      path in this.importedPaths &&
+      this.importedPaths[path].indexOf(destination) > -1);
+};
+
+/** @override */
+importer.TestImportHistory.prototype.markImported =
+    function(entry, destination) {
+  var path = entry.fullPath;
+  if (path in this.importedPaths) {
+    this.importedPaths[path].push(destination);
+  } else {
+    this.importedPaths[path] = [destination];
+  }
+  return Promise.resolve();
+};
+
+/** @override */
+importer.TestImportHistory.prototype.addObserver = function() {};
+
+/** @override */
+importer.TestImportHistory.prototype.removeObserver = function() {};