[GRC] Coordination Unit Graph Observer

services/resource_coordinator/coordination_unit/coordination_unit_graph_observer.cc

Index: services/resource_coordinator/coordination_unit/coordination_unit_graph_observer.cc
diff --git a/services/resource_coordinator/coordination_unit/coordination_unit_graph_observer.cc b/services/resource_coordinator/coordination_unit/coordination_unit_graph_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c4214ebfa61ed72df2806fadc29e666093856537
--- /dev/null
+++ b/services/resource_coordinator/coordination_unit/coordination_unit_graph_observer.cc
@@ -0,0 +1,31 @@
+// 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 "services/resource_coordinator/coordination_unit/coordination_unit_graph_observer.h"
+
+#include "services/resource_coordinator/public/cpp/coordination_unit_types.h"
+
+namespace resource_coordinator {
+
+// Setting filter_ to CoordinationUnitType::kInvalidType bypasses the
+// filtering used to determine whether or not
+// CoordinationUnitGraphObserver::CoordinationUnitCreated should be invoked
+// when a new CoordinationUnitImpl is created in the CoordinationUnitManager.
+CoordinationUnitGraphObserver::CoordinationUnitGraphObserver()
+    : filter_(CoordinationUnitType::kInvalidType) {}
+
+CoordinationUnitGraphObserver::CoordinationUnitGraphObserver(
+    CoordinationUnitType filter)
+    : filter_(filter) {}
+
+CoordinationUnitGraphObserver::~CoordinationUnitGraphObserver() = default;
+
+bool CoordinationUnitGraphObserver::ShouldObserve(
+    CoordinationUnitImpl* coordination_unit) {
+  // CoordinationUnitType::kInvalidType overrides filtering.
+  return filter_ == CoordinationUnitType::kInvalidType ||
+         filter_ == coordination_unit->id().type;
+}
+
+}  // namespace resource_coordinator