[sync] WebContentsObserver based sessions notifications

chrome/browser/sync/sessions/sync_sessions_multi_windowed_web_contents_router.h

+// Copyright 2017 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_SESSIONS_SYNC_SESSIONS_MULTI_WINDOWED_WEB_CONTENTS_ROUTER_H_
+#define CHROME_BROWSER_SYNC_SESSIONS_SYNC_SESSIONS_MULTI_WINDOWED_WEB_CONTENTS_ROUTER_H_
+
+#include "chrome/browser/sync/sessions/sync_sessions_web_contents_router.h"
+#include "chrome/browser/ui/browser_list_observer.h"
+#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
+
+class Profile;
+
+namespace sync_sessions {
+
+// Non-android subclass of SyncSessionsWebContentsRouter that adds tracking for
+// multi-window scenarios(e.g. tab movement between windows). Android doesn't
+// have a BrowserList or TabStrip, so it doesn't compile the needed
+// dependencies, nor would it benefit from the added tracking.
+class SyncSessionsMultiWindowedWebContentsRouter

[Nicolas Zea, 2017/03/20 18:14:50]

Multi-windowed is a bit unclear of a name (Android can in fact have multiple
windows). Consider renaming, perhaps we should just call it
BrowserListWebContentsRouter?

[Patrick Noland, 2017/03/21 22:54:30]

Done.

+    : public SyncSessionsWebContentsRouter,
+      public chrome::BrowserListObserver,
+      public TabStripModelObserver {
+ public:
+  explicit SyncSessionsMultiWindowedWebContentsRouter(Profile* profile);
+
+  // KeyedService implementation.
+  void Shutdown() override;
+
+ protected:
+  ~SyncSessionsMultiWindowedWebContentsRouter() override;
+
+ private:
+  // chrome::BrowserListObserver implementation.
+  void OnBrowserAdded(Browser* browser) override;
+  void OnBrowserRemoved(Browser* browser) override;
+  // TabStripModelObserver implementation.
+  void TabInsertedAt(TabStripModel* model,
+                     content::WebContents* web_contents,
+                     int index,
+                     bool foreground) override;
+};
+
+}  // namespace sync_sessions
+
+#endif  // CHROME_BROWSER_SYNC_SESSIONS_SYNC_SESSIONS_MULTI_WINDOWED_WEB_CONTENTS_ROUTER_H_