Files.app: Stop to use drive thumbnail for cached files.

ui/file_manager/file_manager/foreground/js/thumbnail_loader_unittest.js

Index: ui/file_manager/file_manager/foreground/js/thumbnail_loader_unittest.js
diff --git a/ui/file_manager/file_manager/foreground/js/thumbnail_loader_unittest.js b/ui/file_manager/file_manager/foreground/js/thumbnail_loader_unittest.js
new file mode 100644
index 0000000000000000000000000000000000000000..b306b668b37432f12e317daa29818b1a41d13a85
--- /dev/null
+++ b/ui/file_manager/file_manager/foreground/js/thumbnail_loader_unittest.js
@@ -0,0 +1,35 @@
+// Copyright 2015 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.
+
+function getLoadTarget(entry, metadata) {
+  return new ThumbnailLoader(entry, null, metadata).getLoadTarget();
+}
+
+function testShouldUseMetadataThumbnail() {
+  var mockFileSystem = new MockFileSystem('volumeId');
+  var imageEntry = new MockEntry(mockFileSystem, '/test.jpg');
+  var pdfEntry = new MockEntry(mockFileSystem, '/test.pdf');
+
+  // Embed thumbnail is provided.
+  assertEquals(
+      ThumbnailLoader.LoadTarget.CONTENT_METADATA,
+      getLoadTarget(imageEntry, {thumbnail: {url: 'url'}}));
+
+  // Drive thumbnail is provided and the file is not cached locally.
+  assertEquals(
+      ThumbnailLoader.LoadTarget.EXTERNAL_METADATA,
+      getLoadTarget(imageEntry, {external: {thumbnailUrl: 'url'}}));
+
+  // Drive thumbnail is provided but the file is not synced.
+  assertEquals(
+      ThumbnailLoader.LoadTarget.FILE_ENTRY,
+      getLoadTarget(
+          imageEntry, {external: {thumbnailUrl: 'url', dirty: true}}));
+
+  // Drive thumbnail is provided and it is not an image file.
+  assertEquals(
+      ThumbnailLoader.LoadTarget.EXTERNAL_METADATA,
+      getLoadTarget(
+          pdfEntry, {external: {thumbnailUrl: 'url', dirty: true}}));
+}