Initial native keyboard proof of concept.

services/keyboard_native/keyboard_service_impl.h

Index: services/keyboard_native/keyboard_service_impl.h
diff --git a/services/keyboard_native/keyboard_service_impl.h b/services/keyboard_native/keyboard_service_impl.h
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+// Copyright 2015 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.
+
+#include "base/macros.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+#include "mojo/services/keyboard/public/interfaces/keyboard.mojom.h"
+
+namespace keyboard {
+
+class KeyboardServiceImpl : public KeyboardService {
+ public:
+  explicit KeyboardServiceImpl(mojo::InterfaceRequest<KeyboardService> request);
+  ~KeyboardServiceImpl() override;
+
+  // KeyboardService implementation.
+  void Show(KeyboardClientPtr client) override;
+  void ShowByRequest() override;
+  void Hide() override;
+
+ private:
+  mojo::StrongBinding<KeyboardService> strong_binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(KeyboardServiceImpl);
+};
+
+}  // namespace keyboard