[Sync] Refactoring polling to be reliable.

sync/internal_api/sync_manager_impl.cc

Index: sync/internal_api/sync_manager_impl.cc
diff --git a/sync/internal_api/sync_manager_impl.cc b/sync/internal_api/sync_manager_impl.cc
index 8d96efa689ddf8a9a8a1f3828d91367cac01ae53..45e57f8122150f49c6a8758b89e600c791f755b2 100644
--- a/sync/internal_api/sync_manager_impl.cc
+++ b/sync/internal_api/sync_manager_impl.cc
@@ -218,7 +218,7 @@ void SyncManagerImpl::ConfigureSyncer(
                              ready_task,
                              retry_task);
 
-  scheduler_->Start(SyncScheduler::CONFIGURATION_MODE);
+  scheduler_->Start(SyncScheduler::CONFIGURATION_MODE, base::Time());
   scheduler_->ScheduleConfiguration(params);
 }
 
@@ -335,7 +335,7 @@ void SyncManagerImpl::Init(InitArgs* args) {
   scheduler_ = args->internal_components_factory->BuildScheduler(
       name_, session_context_.get(), args->cancelation_signal).Pass();
 
-  scheduler_->Start(SyncScheduler::CONFIGURATION_MODE);
+  scheduler_->Start(SyncScheduler::CONFIGURATION_MODE, base::Time());
 
   initialized_ = true;
 
@@ -407,7 +407,8 @@ void SyncManagerImpl::OnPassphraseTypeChanged(
 }
 
 void SyncManagerImpl::StartSyncingNormally(
-    const ModelSafeRoutingInfo& routing_info) {
+    const ModelSafeRoutingInfo& routing_info,
+    base::Time last_poll_time) {
   // Start the sync scheduler.
   // TODO(sync): We always want the newest set of routes when we switch back
   // to normal mode. Figure out how to enforce set_routing_info is always
@@ -415,7 +416,8 @@ void SyncManagerImpl::StartSyncingNormally(
   // mode.
   DCHECK(thread_checker_.CalledOnValidThread());
   session_context_->SetRoutingInfo(routing_info);
-  scheduler_->Start(SyncScheduler::NORMAL_MODE);
+  scheduler_->Start(SyncScheduler::NORMAL_MODE,
+                    last_poll_time);
 }
 
 syncable::Directory* SyncManagerImpl::directory() {