[sync] Prevent sessions flare on startup

chrome/browser/sync/sessions/sync_sessions_web_contents_router.h

Index: chrome/browser/sync/sessions/sync_sessions_web_contents_router.h
diff --git a/chrome/browser/sync/sessions/sync_sessions_web_contents_router.h b/chrome/browser/sync/sessions/sync_sessions_web_contents_router.h
index dc698f280ca2704828061d015f5c64af68173c63..7a706c68d491d843ad63aa8ef01a8c2c0fdabb66 100644
--- a/chrome/browser/sync/sessions/sync_sessions_web_contents_router.h
+++ b/chrome/browser/sync/sessions/sync_sessions_web_contents_router.h
@@ -24,6 +24,7 @@ class Profile;
 namespace sync_sessions {
 
 class BrowserListRouterHelper;
+class SyncSessionsClient;
 
 // WebContentsObserver-based implementation of LocalSessionEventRouter. This
 // class is responsible for notifying Sessions Sync when local tabs are
@@ -40,6 +41,9 @@ class SyncSessionsWebContentsRouter : public LocalSessionEventRouter,
   // Inject a flare that can be used to start sync. See the comment for
   // StartSyncFlare in syncable_service.h for more.
   void InjectStartSyncFlare(syncer::SyncableService::StartSyncFlare flare);
+  void SetSyncSessionsClient(SyncSessionsClient* sessions_client) {

[skym, 2017/04/18 15:50:51]

https://google.github.io/styleguide/cppguide.html#Function_Names

I thought the name should be something like set_sync_sessions_client(...), but
apparently that is optional. I personally like your casing more. So lets not
change anything :)

[Patrick Noland, 2017/04/18 22:37:41]

Acknowledged.

+    sessions_client_ = sessions_client;
+  }
 
   // SessionsSyncManager::LocalEventRouter implementation.
   void StartRoutingTo(LocalSessionEventHandler* handler) override;
@@ -57,6 +61,7 @@ class SyncSessionsWebContentsRouter : public LocalSessionEventRouter,
   std::unique_ptr<base::CallbackList<void(const std::set<GURL>&,
                                           const GURL&)>::Subscription>
       favicon_changed_subscription_;
+  SyncSessionsClient* sessions_client_ = nullptr;
   syncer::SyncableService::StartSyncFlare flare_;
   LocalSessionEventHandler* handler_ = nullptr;