File system API: whitelist the Downloads dir on Chrome OS.

chrome/browser/extensions/api/file_system/file_system_apitest.cc

 // 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.
 
 #include "apps/saved_files_service.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "build/build_config.h"
 #include "chrome/browser/extensions/api/file_system/file_system_api.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 436 matching lines @@
       base::MakeAbsoluteFilePath(TempFilePath("open_existing.txt", true));
   ASSERT_FALSE(test_file.empty());
   ASSERT_TRUE(PathService::OverrideAndCreateIfNeeded(
       chrome::DIR_USER_DATA, test_file.DirName(), false));
   FileSystemChooseEntryFunction::SkipPickerAndAlwaysSelectPathForTest(
       &test_file);
   ASSERT_TRUE(RunPlatformAppTest(
       "api_test/file_system/open_writable_existing_non_writable")) << message_;
 }
 
+#if defined(OS_CHROMEOS)
+// In Chrome OS the download directory is whitelisted for write.
+IN_PROC_BROWSER_TEST_F(FileSystemApiTest,
+                       FileSystemApiOpenInDownloadDirForWrite) {
+  base::FilePath test_file =
+      base::MakeAbsoluteFilePath(TempFilePath("writable.txt", true));
+  ASSERT_FALSE(test_file.empty());
+  ASSERT_TRUE(PathService::OverrideAndCreateIfNeeded(
+      chrome::DIR_USER_DATA, test_file.DirName(), false));
+  ASSERT_TRUE(PathService::OverrideAndCreateIfNeeded(
+      chrome::DIR_DEFAULT_DOWNLOADS_SAFE, test_file.DirName(), false));
+  FileSystemChooseEntryFunction::SkipPickerAndAlwaysSelectPathForTest(
+      &test_file);
+  ASSERT_TRUE(RunPlatformAppTest(
+      "api_test/file_system/is_writable_file_entry")) << message_;
+}
+#endif
+
 IN_PROC_BROWSER_TEST_F(FileSystemApiTest,
                        FileSystemApiOpenInChromeDirForWrite) {
   base::FilePath test_file =
       base::MakeAbsoluteFilePath(TempFilePath("open_existing.txt", true));
   ASSERT_FALSE(test_file.empty());
   ASSERT_TRUE(PathService::OverrideAndCreateIfNeeded(
       chrome::DIR_APP, test_file.DirName(), false));
   FileSystemChooseEntryFunction::SkipPickerAndAlwaysSelectPathForTest(
       &test_file);
   ASSERT_TRUE(RunPlatformAppTest(
       "api_test/file_system/open_writable_existing_non_writable")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(FileSystemApiTest,
                        FileSystemApiOpenInAppDirectoryForWrite) {
   FileSystemChooseEntryFunction::SkipPickerAndSelectSuggestedPathForTest();
   {
     AppInstallObserver observer(
         base::Bind(SetLastChooseEntryDirectoryToAppDirectory,
                    extensions::ExtensionSystem::Get(
                        profile())->extension_service()->extension_prefs()));
     ASSERT_TRUE(RunPlatformAppTest(
         "api_test/file_system/open_writable_existing_non_writable"))
         << message_;
   }
 }