Mojo Log service and a thread-safe client library.

mojo/services/log/interfaces/log.mojom

Index: mojo/services/log/interfaces/log.mojom
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+// Copyright 2015 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 mojo.log;
+
+import "log/interfaces/entry.mojom";
+
+// An interface for logging.  e.g., to the system log service.
+[ServiceName="mojo::log::Log"]
+interface Log {
+  AddEntry(Entry entry);
+};