Adds routed interface support between RenderFrameHost and RenderFrame

content/public/common/associated_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 CONTENT_PUBLIC_COMMON_ASSOCIATED_INTERFACE_REGISTRY_H_
+#define CONTENT_PUBLIC_COMMON_ASSOCIATED_INTERFACE_REGISTRY_H_
+
+#include <string>
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "mojo/public/cpp/bindings/associated_interface_request.h"
+#include "mojo/public/cpp/bindings/scoped_interface_endpoint_handle.h"
+
+namespace content {
+
+// An AssociatedInterfaceRegistry is a collection of associated interface-
+// binding callbacks mapped by interface name.
+//
+// This is used to register binding callbacks for interfaces which must be
+// associated with some IPC::ChannelProxy, meaning that messages on the
+// interface retain FIFO with respect to legacy Chrome IPC messages sent or
+// dispatched on the channel.
+//
+// The channel with which a registered interface is associated depends on the
+// configuration of the specific AssociatedInterfaceRegistry instance. For
+// example, RenderFrame exposes an instance of this class for which all
+// interfaces are associated with the IPC::SyncChannel to the browser.
+class AssociatedInterfaceRegistry {
+ public:
+  using Binder = base::Callback<void(mojo::ScopedInterfaceEndpointHandle)>;
+
+  virtual ~AssociatedInterfaceRegistry() {}
+
+  // Adds an interface binder to the registry.
+  virtual void AddInterface(const std::string& name, const Binder& binder) = 0;
+
+  // Removes an interface binder from the registry.
+  virtual void RemoveInterface(const std::string& name) = 0;
+
+  template <typename Interface>
+  using InterfaceBinder =
+      base::Callback<void(mojo::AssociatedInterfaceRequest<Interface>)>;
+
+  // Templated helper for AddInterface() above.
+  template <typename Interface>
+  void AddInterface(const InterfaceBinder<Interface>& binder) {
+    AddInterface(Interface::Name_,
+                 base::Bind(&BindInterface<Interface>, binder));
+  }
+
+ private:
+  template <typename Interface>
+  static void BindInterface(const InterfaceBinder<Interface>& binder,
+                            mojo::ScopedInterfaceEndpointHandle handle) {
+    mojo::AssociatedInterfaceRequest<Interface> request;
+    request.Bind(std::move(handle));
+    binder.Run(std::move(request));
+  }
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_COMMON_ASSOCIATED_INTERFACE_REGISTRY_H_