Add a blink InterfaceRegistry.

third_party/WebKit/public/platform/InterfaceRegistry.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 InterfaceRegistry_h
+#define InterfaceRegistry_h
+
+#include "base/callback_forward.h"
+#include "mojo/public/cpp/system/message_pipe.h"
+#include "public/platform/WebCommon.h"
+
+#if INSIDE_BLINK
+#include "mojo/public/cpp/bindings/interface_request.h"
+#include "wtf/Functional.h"
+#endif
+
+namespace blink {
+
+using InterfaceFactory = base::Callback<void(mojo::ScopedMessagePipeHandle)>;
+
+class BLINK_PLATFORM_EXPORT InterfaceRegistry {
+ public:
+  virtual void addInterface(const char* name, const InterfaceFactory&) = 0;
+
+#if INSIDE_BLINK
+  static InterfaceRegistry* getEmptyInterfaceRegistry();
+
+  template <typename Interface>
+  void addInterface(
+      std::unique_ptr<WTF::Function<void(mojo::InterfaceRequest<Interface>)>>
+          factory) {
+    addInterface(Interface::Name_,
+                 convertToBaseCallback(WTF::bind(
+                     &InterfaceRegistry::forwardToInterfaceFactory<Interface>,
+                     std::move(factory))));
+  }
+
+ private:
+  template <typename Interface>
+  static void forwardToInterfaceFactory(
+      const std::unique_ptr<
+          WTF::Function<void(mojo::InterfaceRequest<Interface>)>>& factory,
+      mojo::ScopedMessagePipeHandle handle) {
+    (*factory)(mojo::MakeRequest<Interface>(std::move(handle)));
+  }
+#endif  // INSIDE_BLINK
+};
+
+}  // namespace blink
+
+#endif