ozone/platform/wayland: Add support for wl_output_interface

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
index d63945a8a69050d9af00fc92489600ac0ddede6b..bdcf33ef671ae845d96f112259e0f61dfb1cac18 100644
--- a/ui/ozone/platform/wayland/wayland_display.h
+++ b/ui/ozone/platform/wayland/wayland_display.h
@@ -12,6 +12,7 @@
 #include "ui/gfx/native_widget_types.h"
 #include "ui/ozone/platform/wayland/wayland_object.h"
 #include "ui/ozone/platform/wayland/wayland_pointer.h"
+#include "ui/ozone/platform/wayland/wayland_screen.h"
 
 namespace ui {
 
@@ -23,6 +24,7 @@ class WaylandDisplay : public PlatformEventSource,
   WaylandDisplay();
   ~WaylandDisplay() override;
 
+  static WaylandDisplay* GetInstance() { return instance_; }
   bool Initialize();
   bool StartProcessingEvents();
 
@@ -38,6 +40,12 @@ class WaylandDisplay : public PlatformEventSource,
   void AddWindow(gfx::AcceleratedWidget widget, WaylandWindow* window);
   void RemoveWindow(gfx::AcceleratedWidget widget);
 
+  const std::vector<WaylandScreen*>& GetScreenList() const;
+  WaylandScreen* PrimaryScreen() const { return primary_screen_; }

[tonikitoo, 2016/06/06 21:35:15]

Minor:  For the purposes of a simple API, I believe we can have the
PrimaryScreen getter, but maybe we should get rid of "primary_screen_" class
variable, and just return screen_list.Front() here.

Maybe something like:

if (!screen_list_.Size())
  return nullptr;

return screen_list_.Front();

[joone, 2016/06/07 22:27:00]

Done.

+  void OutputSizeChanged(int32_t name, unsigned width, unsigned height);
+
+  void SetOutputCompleteClosure(const base::Closure&);
+
  private:
   void Flush();
   void DispatchUiEvent(Event* event);
@@ -65,6 +73,7 @@ class WaylandDisplay : public PlatformEventSource,
   static void Ping(void* data, xdg_shell* shell, uint32_t serial);
 
   std::map<gfx::AcceleratedWidget, WaylandWindow*> window_map_;
+  static WaylandDisplay* instance_;
 
   wl::Object<wl_display> display_;
   wl::Object<wl_registry> registry_;
@@ -79,6 +88,11 @@ class WaylandDisplay : public PlatformEventSource,
   bool watching_ = false;
   base::MessagePumpLibevent::FileDescriptorWatcher controller_;
 
+  WaylandScreen* primary_screen_;
+  std::vector<WaylandScreen*> screen_list_;
+
+  base::Closure output_complete_closure_;
+
   DISALLOW_COPY_AND_ASSIGN(WaylandDisplay);
 };