ozone/platform/wayland: Add support for wl_output_interface

ui/ozone/platform/wayland/wayland_display.cc

Index: ui/ozone/platform/wayland/wayland_display.cc
diff --git a/ui/ozone/platform/wayland/wayland_display.cc b/ui/ozone/platform/wayland/wayland_display.cc
index 4feb9d7d103496d9977783dd22bd4da09c47a83f..212ca9649de53a660183953b5f241af469d6c265 100644
--- a/ui/ozone/platform/wayland/wayland_display.cc
+++ b/ui/ozone/platform/wayland/wayland_display.cc
@@ -25,7 +25,11 @@ const uint32_t kMaxXdgShellVersion = 1;
 
 WaylandDisplay::WaylandDisplay() {}
 
-WaylandDisplay::~WaylandDisplay() {}
+WaylandDisplay::~WaylandDisplay() {
+  for (WaylandScreen* screen : screen_list_)
+    delete screen;
+  screen_list_.clear();
+}
 
 bool WaylandDisplay::Initialize() {
   static const wl_registry_listener registry_listener = {
@@ -106,6 +110,12 @@ void WaylandDisplay::RemoveWindow(gfx::AcceleratedWidget widget) {
   window_map_.erase(widget);
 }
 
+WaylandScreen* WaylandDisplay::PrimaryScreen() const {
+  if (!screen_list_.size())
+    return nullptr;
+  return screen_list_.front();
+}
+
 void WaylandDisplay::OnDispatcherListChanged() {
   StartProcessingEvents();
 }
@@ -127,6 +137,10 @@ void WaylandDisplay::OnFileCanReadWithoutBlocking(int fd) {
 
 void WaylandDisplay::OnFileCanWriteWithoutBlocking(int fd) {}
 
+const std::vector<WaylandScreen*>& WaylandDisplay::GetScreenList() const {
+  return screen_list_;
+}
+
 // static
 void WaylandDisplay::Global(void* data,
                             wl_registry* registry,
@@ -169,6 +183,18 @@ void WaylandDisplay::Global(void* data,
     xdg_shell_add_listener(display->shell_.get(), &shell_listener, display);
     xdg_shell_use_unstable_version(display->shell_.get(),
                                    XDG_SHELL_VERSION_CURRENT);
+  } else if (strcmp(interface, "wl_output") == 0) {
+    wl::Object<wl_output> output = wl::Bind<wl_output>(registry, name, 1);
+    if (!output) {
+      LOG(ERROR) << "Failed to  bind to wl_output global";

[Michael Forney, 2016/06/14 00:55:18]

Looks like I have a typo double-space, which has propogated to here. Please fix
here and above.

[joone, 2016/06/14 22:10:28]

Done.

+      return;
+    }
+
+    WaylandScreen* screen = new WaylandScreen(registry, name, output.release());
+    if (!display->screen_list_.empty())
+      NOTIMPLEMENTED() << "Multiple screens support is not implemented";
+
+    display->screen_list_.push_back(screen);
   }
 
   display->ScheduleFlush();