Add initial SHM-only Wayland Ozone implementation

ui/ozone/platform/wayland/wayland_display.h

Index: ui/ozone/platform/wayland/wayland_display.h
diff --git a/ui/ozone/platform/wayland/wayland_display.h b/ui/ozone/platform/wayland/wayland_display.h
new file mode 100644
index 0000000000000000000000000000000000000000..bdc35798c01358650f1d756d6f0ab058357ecd1d
--- /dev/null
+++ b/ui/ozone/platform/wayland/wayland_display.h
@@ -0,0 +1,73 @@
+// 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_DISPLAY_H_
+#define UI_OZONE_PLATFORM_WAYLAND_WAYLAND_DISPLAY_H_
+
+#include <map>
+
+#include "base/message_loop/message_pump_libevent.h"

[rjkroege, 2016/01/25 20:41:31]

Sadly, I can't remember why but I recall that this may prove regrettable.

[Michael Forney, 2016/01/26 02:25:26]

Hmm. You mean using MessagePumpLibevent? That's what's recommended in
https://www.chromium.org/developers/design-documents/ozone. Are there other
alternatives I should consider?

+#include "ui/events/platform/platform_event_source.h"
+#include "ui/gfx/native_widget_types.h"
+#include "ui/ozone/platform/wayland/wayland_object.h"
+
+namespace ui {
+
+class WaylandWindow;
+
+class WaylandDisplay : public PlatformEventSource,
+                       public base::MessagePumpLibevent::Watcher {
+ public:
+  WaylandDisplay();
+  ~WaylandDisplay() override;
+
+  bool Initialize();
+
+  // Flushes the Wayland connection.
+  void Flush();
+
+  wl_compositor* compositor() { return compositor_.get(); }
+  wl_shm* shm() { return shm_.get(); }
+  xdg_shell* shell() { return shell_.get(); }
+
+  WaylandWindow* GetWindow(gfx::AcceleratedWidget widget);
+  void AddWindow(WaylandWindow* window);
+  void RemoveWindow(WaylandWindow* window);
+
+ private:
+  // PlatformEventSource
+  void OnDispatcherListChanged() override;
+
+  // base::MessagePumpLibevent::Watcher
+  void OnFileCanReadWithoutBlocking(int fd) override;
+  void OnFileCanWriteWithoutBlocking(int fd) override;
+
+  // wl_registry_listener
+  static void Global(void* data,
+                     wl_registry* registry,
+                     uint32_t name,
+                     const char* interface,
+                     uint32_t version);
+  static void GlobalRemove(void* data, wl_registry* registry, uint32_t name);
+
+  // xdg_shell_listener
+  static void Ping(void* data, xdg_shell* shell, uint32_t serial);
+
+  std::map<gfx::AcceleratedWidget, WaylandWindow*> windows_;

[rjkroege, 2016/01/25 20:41:31]

nit: reading this name at a glance suggests vector or array. consider changing
it to better reflect its use.

[Michael Forney, 2016/01/26 02:25:26]

Changed to window_map_.

+
+  wl::Object<wl_display> display_;
+  wl::Object<wl_registry> registry_;
+  wl::Object<wl_compositor> compositor_;
+  wl::Object<wl_shm> shm_;
+  wl::Object<xdg_shell> shell_;
+
+  bool watching_ = false;
+  base::MessagePumpLibevent::FileDescriptorWatcher controller_;
+
+  DISALLOW_COPY_AND_ASSIGN(WaylandDisplay);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_WAYLAND_WAYLAND_DISPLAY_H_