Perform InterfaceProviderSpec intersection in the ServiceManager

services/service_manager/public/cpp/interface_registry.h

 // 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.
 
 #ifndef SERVICES_SERVICE_MANAGER_PUBLIC_CPP_INTERFACE_REGISTRY_H_
 #define SERVICES_SERVICE_MANAGER_PUBLIC_CPP_INTERFACE_REGISTRY_H_
 
 #include <list>
 #include <memory>
 #include <queue>
 #include <set>
 #include <utility>
 
 #include "base/callback.h"
 #include "base/memory/ptr_util.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "services/service_manager/public/cpp/identity.h"
 #include "services/service_manager/public/cpp/interface_provider_spec.h"
 #include "services/service_manager/public/cpp/lib/callback_binder.h"
 #include "services/service_manager/public/cpp/lib/interface_factory_binder.h"
 #include "services/service_manager/public/interfaces/interface_provider.mojom.h"
 
 namespace service_manager {
 class Connection;
 class InterfaceBinder;
 
+// Returns the set of capabilities required from the target.
+CapabilitySet GetRequestedCapabilities(const InterfaceProviderSpec& source_spec,
+                                       const Identity& target);
+
+// Generates a single set of interfaces that is the union of all interfaces
+// exposed by the target for the capabilities requested by the source.
+InterfaceSet GetInterfacesToExpose(const InterfaceProviderSpec& source_spec,
+                                   const Identity& target,
+                                   const InterfaceProviderSpec& target_spec);
+
 // An implementation of mojom::InterfaceProvider that allows the user to
 // register services to be exposed to another application.
 //
 // To use, define a class that implements your specific interface. Then
 // implement an InterfaceFactory<Foo> that binds instances of FooImpl to
 // InterfaceRequest<Foo>s and register that on the registry like this:
 //
 //   registry.AddInterface(&factory);
 //
 // Or, if you have multiple factories implemented by the same type, explicitly
@@ skipping 180 matching lines @@
   std::list<base::Closure> connection_lost_closures_;
 
   base::WeakPtrFactory<InterfaceRegistry> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InterfaceRegistry);
 };
 
 }  // namespace service_manager
 
 #endif  // SERVICES_SERVICE_MANAGER_PUBLIC_CPP_INTERFACE_REGISTRY_H_