[sync] WebContentsObserver based sessions notifications

chrome/browser/sync/sessions/sync_sessions_multi_windowed_web_contents_router.cc

+// 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.
+
+#include "chrome/browser/sync/sessions/sync_sessions_multi_windowed_web_contents_router.h"
+
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/sync/tab_contents_synced_tab_delegate.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+
+namespace sync_sessions {
+
+SyncSessionsMultiWindowedWebContentsRouter::
+    SyncSessionsMultiWindowedWebContentsRouter(Profile* profile)
+    : SyncSessionsWebContentsRouter(profile) {
+  BrowserList* browser_list = BrowserList::GetInstance();
+  for (Browser* browser : *browser_list)
+    browser->tab_strip_model()->AddObserver(this);
+  browser_list->AddObserver(this);
+}
+
+SyncSessionsMultiWindowedWebContentsRouter::
+    ~SyncSessionsMultiWindowedWebContentsRouter() {}
+
+void SyncSessionsMultiWindowedWebContentsRouter::Shutdown() {
+  SyncSessionsWebContentsRouter::Shutdown();
+  BrowserList* browser_list = BrowserList::GetInstance();
+  for (Browser* browser : *browser_list)
+    browser->tab_strip_model()->RemoveObserver(this);
+  BrowserList::GetInstance()->RemoveObserver(this);
+}
+
+void SyncSessionsMultiWindowedWebContentsRouter::OnBrowserAdded(
+    Browser* browser) {
+  browser->tab_strip_model()->AddObserver(this);
+}
+
+void SyncSessionsMultiWindowedWebContentsRouter::OnBrowserRemoved(
+    Browser* browser) {
+  browser->tab_strip_model()->RemoveObserver(this);
+}
+
+void SyncSessionsMultiWindowedWebContentsRouter::TabInsertedAt(
+    TabStripModel* model,
+    content::WebContents* web_contents,
+    int index,
+    bool foreground) {
+  if (handler_ && web_contents) {
+    SyncedTabDelegate* delegate =
+        TabContentsSyncedTabDelegate::FromWebContents(web_contents);
+    if (delegate)
+      handler_->OnLocalTabModified(delegate);
+  }
+}
+
+}  // namespace sync_sessions