Update from https://crrev.com/333737

base/prefs/json_pref_store_unittest.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 "base/prefs/json_pref_store.h"
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/location.h"
@@ skipping 910 matching lines @@
                        WriteablePrefStore::LOSSY_PREF_WRITE_FLAG);
   ASSERT_TRUE(file_writer->HasPendingWrite());
 
   // Call DoScheduledWrite and check both prefs get written.
   file_writer->DoScheduledWrite();
   ASSERT_EQ("{\"lossy\":\"lossy\",\"normal\":\"normal\"}",
             GetTestFileContents());
   ASSERT_FALSE(file_writer->HasPendingWrite());
 }
 
+TEST_F(JsonPrefStoreLossyWriteTest, ScheduleLossyWrite) {
+  scoped_refptr<JsonPrefStore> pref_store = CreatePrefStore();
+  ImportantFileWriter* file_writer = GetImportantFileWriter(pref_store);
+
+  // Set a lossy pref and check that it is not scheduled to be written.
+  pref_store->SetValue("lossy", new base::StringValue("lossy"),
+                       WriteablePrefStore::LOSSY_PREF_WRITE_FLAG);
+  ASSERT_FALSE(file_writer->HasPendingWrite());
+
+  // Schedule pending lossy writes and check that it is scheduled.
+  pref_store->SchedulePendingLossyWrites();
+  ASSERT_TRUE(file_writer->HasPendingWrite());
+
+  // Call CommitPendingWrite and check that the lossy pref is there with the
+  // last value set above.
+  pref_store->CommitPendingWrite();
+  ASSERT_FALSE(file_writer->HasPendingWrite());
+  ASSERT_EQ("{\"lossy\":\"lossy\"}", GetTestFileContents());
+}
+
 }  // namespace base