Implement new SyncAPI and convert Preferences to it.

chrome/browser/sync/api/sync_event.h

+// 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.
+
+#ifndef CHROME_BROWSER_SYNC_API_SYNC_EVENT_H_
+#define CHROME_BROWSER_SYNC_API_SYNC_EVENT_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "chrome/browser/sync/api/sync_data.h"
+
+// A SyncEvent object reflects a change to a piece of synced data. The change
+// can be either a delete, add, or an update. All data relevant to the change
+// is encapsulated within the SyncEvent, which, once created, is immutable.
+// Note: it is safe and cheap to pass these by value or make copies, as they do
+// not create deep copies of their internal data.
+class SyncEvent {

[akalin, 2011/05/19 00:58:45]

As we discussed, SyncEvent -> SyncChange, etc.

[Nicolas Zea, 2011/05/19 21:17:45]

Done.

+ public:
+  enum SyncEventType {
+    ACTION_INVALID,
+    ACTION_ADD,
+    ACTION_UPDATE,
+    ACTION_DELETE
+  };
+
+  // Default constructor creates an invalid event.
+  SyncEvent();
+  // Create a new event with the specified sync data.
+  SyncEvent(SyncEventType event_type, const SyncData& sync_data);
+  ~SyncEvent();
+
+  // Copy constructor and assignment operator welcome.
+
+  // Whether this event is valid. This must be true before attempting to access
+  // the data.
+  // Deletes: Requires valid tag when going to the syncer. Requires valid
+  //          specifics when coming from the syncer.
+  // Adds, Updates: Require valid tag and specifics when going to the syncer.
+  //                Require only valid specifics when coming from the syncer.
+  bool IsValid() const;
+
+  // Getters.
+  SyncEventType event_type() const;
+  SyncData sync_data() const;
+
+ private:
+  SyncEventType event_type_;
+
+  // An immutable container for the data of this SyncEvent. Whenever
+  // SyncEvents are copied, they copy references to this data.
+  SyncData sync_data_;
+};
+
+// Ordered list of SyncEvent's.
+typedef std::vector<SyncEvent> SyncEventList;

[akalin, 2011/05/19 00:58:45]

Remove this (already in sync_event_processor.h)

[Nicolas Zea, 2011/05/19 21:17:45]

Done.

+
+#endif  // CHROME_BROWSER_SYNC_API_SYNC_EVENT_H_