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

[dcheng, 2017/04/18 05:40:46]

Out of curiosity, why not use the mojo enum directly?

[oystein (OOO til 10th of July), 2017/04/18 20:55:33]

The idea is that the CUIDs will become more integrated with scheduler cost
attribution and will to be used by base/ and other places that can't use Mojo,
down the road.

+// coordination_unit.mojom, and have mappings between the two defined in
+// coordination_unit_struct_traits.h/.cc
+enum CoordinationUnitType {
+  INVALID_TYPE,

[dcheng, 2017/04/18 05:40:47]

This doesn't seem to be used. Is it needed?

[oystein (OOO til 10th of July), 2017/04/18 20:55:33]

Nope really; removed.

+  WEBCONTENTS,
+  FRAME,
+  NAVIGATION,
+  PROCESS,
+};
+
+struct CoordinationUnitID {
+  CoordinationUnitType type;
+  int32 id;
+};
+
+struct Policy {
+  bool use_background_priority;
+};
+
+interface PolicyCallback {
+  SetPolicy(Policy 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);
+  AddChild(CoordinationUnitID child_id);
+  SetPolicyCallback(PolicyCallback callback);
+};