ozone/platform/wayland: Add support for wl_output_interface

ui/ozone/platform/wayland/wayland_screen.h

Index: ui/ozone/platform/wayland/wayland_screen.h
diff --git a/ui/ozone/platform/wayland/wayland_screen.h b/ui/ozone/platform/wayland/wayland_screen.h
new file mode 100644
index 0000000000000000000000000000000000000000..f52bcdf11c5822d851c14c554d07790f5bf519de
--- /dev/null
+++ b/ui/ozone/platform/wayland/wayland_screen.h
@@ -0,0 +1,61 @@
+// 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_SCREEN_H_
+#define UI_OZONE_PLATFORM_WAYLAND_WAYLAND_SCREEN_H_
+
+#include <stdint.h>
+
+#include "base/macros.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/ozone/platform/wayland/wayland_object.h"
+
+struct wl_output;
+struct wl_registry;
+
+namespace ui {
+
+// WaylandScreen objects keep track of the current outputs (screens/monitors)
+// that are available to the application.
+class WaylandScreen {
+ public:
+  WaylandScreen(wl_registry* registry, uint32_t name);
+  ~WaylandScreen();
+
+  // Returns the active allocation of the screen.
+  gfx::Rect Geometry() const { return rect_; }
+
+ private:
+  // Callback functions that allows the display to initialize the screen's
+  // position and available modes.
+  static void OutputHandleGeometry(void* data,
+                                   wl_output* output,
+                                   int32_t x,
+                                   int32_t y,
+                                   int32_t physical_width,
+                                   int32_t physical_height,
+                                   int32_t subpixel,
+                                   const char* make,
+                                   const char* model,
+                                   int32_t output_transform);
+
+  static void OutputHandleMode(void* data,
+                               wl_output* wl_output,
+                               uint32_t flags,
+                               int32_t width,
+                               int32_t height,
+                               int32_t refresh);
+
+  wl::Object<wl_output> output_;
+
+  int32_t name_;
+  int32_t refresh_;
+  gfx::Rect rect_;
+
+  DISALLOW_COPY_AND_ASSIGN(WaylandScreen);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_WAYLAND_WAYLAND_SCREEN_H_