Implement Stub for policy bridge to ARC

components/arc/common/policy.mojom

Index: components/arc/common/policy.mojom
diff --git a/components/arc/common/policy.mojom b/components/arc/common/policy.mojom
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+// Copyright 2016 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 arc;
+
+interface PolicyHost {
+  // Get policies from Chrome OS, as JSON-encoded dictionary with the policies'
+  // names as keys and their values as values. The list of possible policies can
+  // be found in components/policy/resources/policy_templates.json
+  GetPolicies@0() => (string policies);
+};
+
+interface PolicyInstance {
+  // Establishes full-duplex communication with the host.
+  Init@0(PolicyHost host_ptr);
+
+  // Indicates some policies have changed
+  OnPolicyUpdated@1();
+};