Add beginnings of an inspector backend for Sky

sky/framework/inspector/server/inspector.mojom

Index: sky/framework/inspector/server/inspector.mojom
diff --git a/sky/framework/inspector/server/inspector.mojom b/sky/framework/inspector/server/inspector.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..69974084dc0202887fff5e562202f65d360a5b61
--- /dev/null
+++ b/sky/framework/inspector/server/inspector.mojom
@@ -0,0 +1,20 @@
+// Copyright 2014 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 sky {
+
+[Client=InspectorBackend]
+interface InspectorFrontend {
+  Listen(int32 port);
+  SendMessage(string message);
+};
+
+[Client=InspectorFrontend]
+interface InspectorBackend {
+  OnConnect();
+  OnDisconnect();
+  OnMessage(string message);
+};
+
+}