Add frame-specific InterfaceProviderSpec.

content/common/frame.mojom

 // 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 content.mojom;
 
 import "services/service_manager/public/interfaces/interface_provider.mojom";
 
+// The name of the InterfaceProviderSpec in service manifests used by the
+// frame tree to expose frame-specific interfaces between renderer and browser.
+const string kNavigation_FrameSpec = "navigation:frame";
+
 // Implemented by the frame provider (e.g. renderer processes).
 interface Frame {
   GetInterfaceProvider(service_manager.mojom.InterfaceProvider& interfaces);
 };
 
 // Implemented by the frame server (i.e. the browser process).
 interface FrameHost {
   GetInterfaceProvider(service_manager.mojom.InterfaceProvider& interfaces);
 };
 
 // Implemented by a service that provides implementations of the Frame
 // interface. (e.g. renderer processes).
 interface FrameFactory {
   CreateFrame(int32 frame_routing_id, Frame& frame, FrameHost host);
 };