[ozone/wayland] Implement basic keyboard handling support

ui/ozone/platform/wayland/wayland_keyboard.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 UI_OZONE_PLATFORM_WAYLAND_WAYLAND_KEYBOARD_H_
+#define UI_OZONE_PLATFORM_WAYLAND_WAYLAND_KEYBOARD_H_
+
+#include "ui/events/ozone/evdev/event_modifiers_evdev.h"
+#include "ui/events/ozone/evdev/keyboard_evdev.h"
+#include "ui/ozone/platform/wayland/wayland_object.h"
+
+namespace ui {
+
+class WaylandKeyboard {
+ public:
+  WaylandKeyboard(wl_keyboard* keyboard, const EventDispatchCallback& callback);
+  virtual ~WaylandKeyboard();
+
+ private:
+  // wl_keyboard_listener
+  static void Keymap(void* data,
+                     wl_keyboard* obj,
+                     uint32_t format,
+                     int32_t fd,
+                     uint32_t size);
+  static void Enter(void* data,
+                    wl_keyboard* obj,
+                    uint32_t serial,
+                    wl_surface* surface,
+                    wl_array* keys);
+  static void Leave(void* data,
+                    wl_keyboard* obj,
+                    uint32_t serial,
+                    wl_surface* surface);
+  static void Key(void* data,
+                  wl_keyboard* obj,
+                  uint32_t serial,
+                  uint32_t time,
+                  uint32_t key,
+                  uint32_t state);
+  static void Modifiers(void* data,
+                        wl_keyboard* obj,
+                        uint32_t serial,
+                        uint32_t mods_depressed,
+                        uint32_t mods_latched,
+                        uint32_t mods_locked,
+                        uint32_t group);
+  static void RepeatInfo(void* data,
+                         wl_keyboard* obj,
+                         int32_t rate,
+                         int32_t delay);
+
+  wl::Object<wl_keyboard> obj_;
+  EventModifiersEvdev modifiers_;
+  KeyboardEvdev evdev_;

[spang, 2017/01/18 00:59:48]

I don't think using KeyboardEvdev and EventModifiersEvdev (or, in general,
anything from events/ozone/evdev) is likely to be the right approach for wayland
keyboard integration. Those classes implement low level keyboard handling for
Chrome OS, but the wayland compositor is responsible for that. For example
active modifiers are deliver to you here in Modifiers(), whereas KeyboardEvdev
will try to calculate that itself and things are likely to get out of sync.

+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_WAYLAND_WAYLAND_KEYBOARD_H_