Revert 112815 - [Sync] Make syncer commands avoid posting tasks on threads with no work to do

chrome/browser/sync/sessions/sync_session.cc

Index: chrome/browser/sync/sessions/sync_session.cc
===================================================================
--- chrome/browser/sync/sessions/sync_session.cc	(revision 112854)
+++ chrome/browser/sync/sessions/sync_session.cc	(working copy)
@@ -6,48 +6,12 @@
 
 #include <algorithm>
 
-#include "base/logging.h"
 #include "chrome/browser/sync/syncable/directory_manager.h"
 #include "chrome/browser/sync/syncable/model_type.h"
 
 namespace browser_sync {
 namespace sessions {
 
-namespace {
-
-std::set<ModelSafeGroup> ComputeEnabledGroups(
-    const ModelSafeRoutingInfo& routing_info,
-    const std::vector<ModelSafeWorker*>& workers) {
-  std::set<ModelSafeGroup> enabled_groups;
-  // Project the list of enabled types (i.e., types in the routing
-  // info) to a list of enabled groups.
-  for (ModelSafeRoutingInfo::const_iterator it = routing_info.begin();
-       it != routing_info.end(); ++it) {
-    enabled_groups.insert(it->second);
-  }
-  // GROUP_PASSIVE is always enabled, since that's the group that
-  // top-level folders map to.
-  enabled_groups.insert(GROUP_PASSIVE);
-  if (DCHECK_IS_ON()) {
-    // We sometimes create dummy SyncSession objects (see
-    // SyncScheduler::InitialSnapshot) so don't check in that case.
-    if (!routing_info.empty() || !workers.empty()) {
-      std::set<ModelSafeGroup> groups_with_workers;
-      for (std::vector<ModelSafeWorker*>::const_iterator it = workers.begin();
-           it != workers.end(); ++it) {
-        groups_with_workers.insert((*it)->GetModelSafeGroup());
-      }
-      // All enabled groups should have a corresponding worker.
-      DCHECK(std::includes(
-          groups_with_workers.begin(), groups_with_workers.end(),
-          enabled_groups.begin(), enabled_groups.end()));
-    }
-  }
-  return enabled_groups;
-}
-
-}  // namesepace
-
 SyncSession::SyncSession(SyncSessionContext* context, Delegate* delegate,
     const SyncSourceInfo& source,
     const ModelSafeRoutingInfo& routing_info,
@@ -57,8 +21,7 @@
       write_transaction_(NULL),
       delegate_(delegate),
       workers_(workers),
-      routing_info_(routing_info),
-      enabled_groups_(ComputeEnabledGroups(routing_info_, workers_)) {
+      routing_info_(routing_info) {
   status_controller_.reset(new StatusController(routing_info_));
   std::sort(workers_.begin(), workers_.end());
 }
@@ -90,18 +53,15 @@
        ++it) {
     routing_info_[it->first] = it->second;
   }
-
-  // Now update enabled groups.
-  enabled_groups_ = ComputeEnabledGroups(routing_info_, workers_);
 }
 
-void SyncSession::RebaseRoutingInfoWithLatest(const SyncSession& session) {
+void SyncSession::RebaseRoutingInfoWithLatest(SyncSession* session) {
   ModelSafeRoutingInfo temp_routing_info;
 
   // Take the intersecion and also set the routing info(it->second) from the
   // passed in session.
   for (ModelSafeRoutingInfo::const_iterator it =
-       session.routing_info_.begin(); it != session.routing_info_.end();
+       session->routing_info_.begin(); it != session->routing_info_.end();
        ++it) {
     if (routing_info_.find(it->first) != routing_info_.end()) {
       temp_routing_info[it->first] = it->second;
@@ -112,17 +72,14 @@
   routing_info_.swap(temp_routing_info);
 
   // Now update the payload map.
-  PurgeStalePayload(&source_.types, session.routing_info_);
+  PurgeStalePayload(&source_.types, session->routing_info_);
 
   // Now update the workers.
   std::vector<ModelSafeWorker*> temp;
   std::set_intersection(workers_.begin(), workers_.end(),
-                 session.workers_.begin(), session.workers_.end(),
+                 session->workers_.begin(), session->workers_.end(),
                  std::back_inserter(temp));
   workers_.swap(temp);
-
-  // Now update enabled groups.
-  enabled_groups_ = ComputeEnabledGroups(routing_info_, workers_);
 }
 
 void SyncSession::ResetTransientState() {
@@ -184,46 +141,7 @@
       status->conflicts_resolved();
       // Or, we have conflicting updates, but we're making progress on
       // resolving them...
-}
-
-const std::set<ModelSafeGroup>& SyncSession::GetEnabledGroups() const {
-  return enabled_groups_;
-}
-
-std::set<ModelSafeGroup> SyncSession::GetEnabledGroupsWithConflicts() const {
-  const std::set<ModelSafeGroup>& enabled_groups = GetEnabledGroups();
-  std::set<ModelSafeGroup> enabled_groups_with_conflicts;
-  for (std::set<ModelSafeGroup>::const_iterator it =
-           enabled_groups.begin(); it != enabled_groups.end(); ++it) {
-    const sessions::ConflictProgress* conflict_progress =
-        status_controller_->GetUnrestrictedConflictProgress(*it);
-    if (conflict_progress &&
-        (conflict_progress->ConflictingItemsBegin() !=
-         conflict_progress->ConflictingItemsEnd())) {
-      enabled_groups_with_conflicts.insert(*it);
-    }
   }
-  return enabled_groups_with_conflicts;
-}
 
-std::set<ModelSafeGroup>
-    SyncSession::GetEnabledGroupsWithVerifiedUpdates() const {
-  const std::set<ModelSafeGroup>& enabled_groups = GetEnabledGroups();
-  std::set<ModelSafeGroup> enabled_groups_with_verified_updates;
-  for (std::set<ModelSafeGroup>::const_iterator it =
-           enabled_groups.begin(); it != enabled_groups.end(); ++it) {
-    const UpdateProgress* update_progress =
-        status_controller_->GetUnrestrictedUpdateProgress(*it);
-    if (update_progress &&
-        (update_progress->VerifiedUpdatesBegin() !=
-         update_progress->VerifiedUpdatesEnd())) {
-      enabled_groups_with_verified_updates.insert(*it);
-    }
-  }
-
-  return enabled_groups_with_verified_updates;
-}
-
-
 }  // namespace sessions
 }  // namespace browser_sync