[sync] Instantiate the platform appropriate SyncedTabDelegate

chrome/browser/sync/sessions/sync_sessions_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_web_contents_router.h"
 
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #if !defined(OS_ANDROID)
 #include "chrome/browser/sync/sessions/browser_list_router_helper.h"
+#else
+#include "chrome/browser/android/tab_android.h"
 #endif  // !defined(OS_ANDROID)
 #include "chrome/browser/ui/sync/tab_contents_synced_tab_delegate.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "components/history/core/browser/history_service.h"
 #include "components/sync_sessions/synced_tab_delegate.h"
 
 namespace sync_sessions {
 
+namespace {
+
+SyncedTabDelegate* GetSyncedTabDelegateFromWebContents(
+    content::WebContents* web_contents) {
+#if defined(OS_ANDROID)
+  TabAndroid* tab = TabAndroid::FromWebContents(web_contents);
+  return tab ? tab->GetSyncedTabDelegate() : nullptr;
+#else
+  SyncedTabDelegate* delegate =
+      TabContentsSyncedTabDelegate::FromWebContents(web_contents);
+  return delegate;
+#endif
+}
+
+}  // namespace
+
 SyncSessionsWebContentsRouter::SyncSessionsWebContentsRouter(Profile* profile) {
   history::HistoryService* history_service =
       HistoryServiceFactory::GetForProfile(profile,
                                            ServiceAccessType::EXPLICIT_ACCESS);
   if (history_service) {
     favicon_changed_subscription_ = history_service->AddFaviconsChangedCallback(
         base::Bind(&SyncSessionsWebContentsRouter::OnFaviconsChanged,
                    base::Unretained(this)));
   }
 
 #if !defined(OS_ANDROID)
   browser_list_helper_ = base::MakeUnique<BrowserListRouterHelper>(this);
 #endif  // !defined(OS_ANDROID)
 }
 
 SyncSessionsWebContentsRouter::~SyncSessionsWebContentsRouter() {}
 
 void SyncSessionsWebContentsRouter::NotifyTabModified(
     content::WebContents* web_contents) {
   if (handler_ && web_contents) {
     SyncedTabDelegate* delegate =
-        TabContentsSyncedTabDelegate::FromWebContents(web_contents);
+        GetSyncedTabDelegateFromWebContents(web_contents);
     if (delegate)
       handler_->OnLocalTabModified(delegate);
   }
 
   if (!flare_.is_null()) {
     flare_.Run(syncer::SESSIONS);
     flare_.Reset();
   }
 }
 
@@ skipping 20 matching lines @@
 
 void SyncSessionsWebContentsRouter::Shutdown() {
   favicon_changed_subscription_.reset();
 
 #if !defined(OS_ANDROID)
   browser_list_helper_.reset();
 #endif  // !defined(OS_ANDROID)
 }
 
 }  // namespace sync_sessions