Global Resource Coordinator: Basic service internals

services/resource_coordinator/public/interfaces/coordination_unit.mojom

+// 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.
+
+module resource_coordinator.mojom;
+
+import "events.mojom";
+
+// Any new type here needs to be mirrored between coordination_unit_types.h and
+// coordination_unit.mojom, and have mappings between the two defined in
+// coordination_unit_struct_traits.h/.cc (see comment in coordination_unit_id.h).
+enum CoordinationUnitType {
+  kWebContents,
+  kFrame,
+  kNavigation,
+  kProcess,
+};
+
+struct CoordinationUnitID {
+  CoordinationUnitType type;
+  int64 id;
+};
+
+struct CoordinationPolicy {
+  bool use_background_priority;
+};
+
+interface CoordinationPolicyCallback {
+  SetCoordinationPolicy(CoordinationPolicy policy);
+};
+
+interface CoordinationUnit {
+  SendEvent(Event event);
+
+  // Mainly used to force a round-trip to the service over the pipe for
+  // a specific unit, so we don't have to deal with possibly-not-yet-created
+  // children in AddChild()
+  GetID() => (CoordinationUnitID id);
+
+  Duplicate(CoordinationUnit& request);
+  // child_id must represent a CU which already exists service-side,
+  // and can't be a direct ascendent or descendent of the current unit.
+  AddChild(CoordinationUnitID child_id);
+  SetCoordinationPolicyCallback(CoordinationPolicyCallback callback);
+};