Convert NaCl renderer-loader messages to mojo.

components/nacl/common/nacl.mojom

Index: components/nacl/common/nacl.mojom
diff --git a/components/nacl/common/nacl.mojom b/components/nacl/common/nacl.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..70b1286953e948f7caa74074e164d09e8fb437bd
--- /dev/null
+++ b/components/nacl/common/nacl.mojom
@@ -0,0 +1,26 @@
+// 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 nacl.mojom;
+
+[Native]
+enum NaClErrorCode;
+
+interface NaClRendererHost {
+  // This message must be synchronous to ensure that the exit status is sent
+  // from NaCl to the renderer before the NaCl process exits very soon after.
+  [Sync]
+  ReportExitStatus(int32 exit_status) => ();
+
+  // This message must be synchronous to ensure that the load status is sent
+  // from NaCl to the renderer before the NaCl process exits very soon after.
+  [Sync]
+  ReportLoadStatus(NaClErrorCode load_status) => ();
+
+  ProvideExitControl(NaClExitControl exit_control);
+};
+
+// When this interface is closed, it indicates that the NaCl loader process
+// should exit.
+interface NaClExitControl {};