Add browser_tests for FileAPI with Quota.

chrome/test/data/fileapi/quota_test.js

+// Copyright (c) 2011 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 truncateFailByQuota(fs) {
+  fs.root.getFile('fd', {create: false, exclusive: false}, function(fileEntry) {
+    fileEntry.createWriter(function(fileWriter) {
+      var failedInTruncate = false;
+      fileWriter.onerror = function(e) {
+        failedInTruncate = true;
+      };
+      fileWriter.onwriteend = function(e) {
+        if (failedInTruncate) {
+          fail(e.currentTarget.error);
+        } else {
+          done();
+        }
+      };
+      fileWriter.truncate(2500 * 1024);
+    }, unexpectedErrorCallback)
+  }, function(e) { fail("Open"); } );

[kinuko, 2011/08/30 12:12:04]

is it intentional not to use unexpectedErrorCallback here?

[Dai Mikurube (NOT FULLTIME), 2011/08/30 12:58:30]

It will be useful to show where the test fails.  (createWriter uses
unexectedErrorCallback since I guess createWriter hardly fails.)

+}
+
+function requestSuccess(fs) {

[kinuko, 2011/08/30 12:12:04]

nit: requestSuccess -> requestFileSystemSuccess for the sake of clarity?

[Dai Mikurube (NOT FULLTIME), 2011/08/30 12:58:30]

Done.

+  fs.root.getFile('fd', {create: true, exclusive: false}, function(fileEntry) {
+    fileEntry.createWriter(function(fileWriter) {
+      var failedInTruncate = false;
+      fileWriter.onerror = function(e) {
+        debug(e.currentTarget.error);
+        failedInTruncate = true;
+      };
+      fileWriter.onwriteend = function() {
+        if (failedInTruncate) {
+          truncateFailByQuota(fs);
+        } else {
+          fail("No error by quota");

[kinuko, 2011/08/30 12:12:04]

'Unexpectedly succeeded' ?

[Dai Mikurube (NOT FULLTIME), 2011/08/30 12:58:30]

Done.

+        }
+      }
+      fileWriter.truncate(10000 * 1024);
+    }, unexpectedErrorCallback)
+  }, function(e) { fail("Open"); } );
+}
+
+function quotaSuccess(usage, quota) {
+  origReturnedUsage = returnedUsage = usage;
+  origReturnedQuota = returnedQuota = quota;

[kinuko, 2011/08/30 12:12:04]

returned{Usage,Quota} variables are not used?

[Dai Mikurube (NOT FULLTIME), 2011/08/30 12:58:30]

Done.

+  if (origReturnedUsage != 0)
+    fail("Usage is not zero: " + origReturnedUsage);
+  if (origReturnedQuota != 5000 * 1024)
+    fail("Quota is not 5000KiB: " + origReturnedQuota);
+
+  window.webkitRequestFileSystem(
+      window.TEMPORARY,
+      1024 * 1024,
+      requestSuccess,
+      unexpectedErrorCallback);
+}
+
+function test() {
+  if (window.webkitStorageInfo) {
+    window.jsTestIsAsync = true;

[kinuko, 2011/08/30 12:12:04]

Not used/referred?
(This variable is usually referred by a helper script in LayoutTests.)

[Dai Mikurube (NOT FULLTIME), 2011/08/30 12:58:30]

Done.

+    debug('Querying usage and quota.');
+    webkitStorageInfo.queryUsageAndQuota(webkitStorageInfo.TEMPORARY,
+                                         quotaSuccess,
+                                         unexpectedErrorCallback);
+  } else {
+    debug("This test requires window.webkitStorageInfo.");

[kinuko, 2011/08/30 12:12:04]

nit: " -> '

[Dai Mikurube (NOT FULLTIME), 2011/08/30 12:58:30]

Done.

+  }
+}