sync: Finish the SyncScheduler refactor

sync/sessions/nudge_tracker.cc

Index: sync/sessions/nudge_tracker.cc
diff --git a/sync/sessions/nudge_tracker.cc b/sync/sessions/nudge_tracker.cc
new file mode 100644
index 0000000000000000000000000000000000000000..714b67d13f14582e427fdf544c40bc44a067dab8
--- /dev/null
+++ b/sync/sessions/nudge_tracker.cc
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+// Copyright (c) 2013 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 "sync/sessions/nudge_tracker.h"
+#include "sync/protocol/sync.pb.h"
+
+namespace syncer {
+namespace sessions {
+
+NudgeTracker::NudgeTracker() { }
+
+NudgeTracker::~NudgeTracker() { }
+
+void NudgeTracker::CoalesceSources(const SyncSourceInfo& source) {
+  CoalesceStates(source.types, &source_info_.types);
+  source_info_.updates_source = source.updates_source;
+}
+
+bool NudgeTracker::IsEmpty() {
+  return source_info_.types.empty();
+}
+
+void NudgeTracker::Reset() {
+  source_info_ = SyncSourceInfo();
+}
+
+// TODO(rlarocque): This function often reports incorrect results.  However, it
+// is compatible with the "classic" behaviour.  We would need to make the nudge
+// tracker stop overwriting its own information (ie. fix crbug.com/231693)
+// before we could even try to report correct results.  The main issue is that
+// an notifications and local modifications nudges may overlap with each other
+// in sych a way that we lose track of which types were or were not locally
+// modified.
+ModelTypeSet NudgeTracker::GetLocallyModifiedTypes() const {
+  ModelTypeSet locally_modified;
+
+  if (source_info_.updates_source != sync_pb::GetUpdatesCallerInfo::LOCAL) {
+    return locally_modified;
+  }
+
+  for (ModelTypeInvalidationMap::const_iterator i = source_info_.types.begin();
+       i != source_info().types.end(); ++i) {
+    locally_modified.Put(i->first);
+  }
+  return locally_modified;
+}
+
+}  // namespace sessions
+}  // namespace syncer