Support exposing Mojo services between render frames, render threads, and their respective hosts.

content/common/render_frame_setup.mojom

Index: content/common/render_frame_setup.mojom
diff --git a/content/common/render_frame_setup.mojom b/content/common/render_frame_setup.mojom
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index 0000000000000000000000000000000000000000..60e82f20740072ad709617625060eea66bf6a9ec
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+++ b/content/common/render_frame_setup.mojom
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+// 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.
+
+import "../../mojo/public/interfaces/interface_provider/interface_provider.mojom"
+
+module content {
+
+interface RenderFrameSetup {
+  GetServiceProvider(int32 frame_routing_id,
+                     mojo.IInterfaceProvider& service_provider);
+};
+
+}