Move DisplayUtils methods into gfx::Screen.

ui/gfx/screen_gtk.cc

Index: ui/gfx/screen_gtk.cc
diff --git a/ui/gfx/screen_gtk.cc b/ui/gfx/screen_gtk.cc
index 81904e104f6b7c16481625ee20e1a734959cd3ec..42799b70d5dcbff0323e1f344ef838eb3f021cff 100644
--- a/ui/gfx/screen_gtk.cc
+++ b/ui/gfx/screen_gtk.cc
@@ -63,6 +63,7 @@ gfx::Rect Screen::GetMonitorAreaNearestPoint(const gfx::Point& point) {
   return gfx::Rect(bounds);
 }
 
+// static
 gfx::NativeWindow Screen::GetWindowAtCursorScreenPoint() {
   GdkWindow* window = gdk_window_at_pointer(NULL, NULL);
   if (!window)
@@ -77,4 +78,18 @@ gfx::NativeWindow Screen::GetWindowAtCursorScreenPoint() {
   return GTK_IS_WINDOW(widget) ? GTK_WINDOW(widget) : NULL;
 }
 
+// static
+gfx::Size Screen::GetPrimaryMonitorSize() {
+  GdkScreen* screen = gdk_screen_get_default();
+  return gfx::Size(gdk_screen_get_width(screen), gdk_screen_get_height(screen));
+}
+
+// static
+int Screen::GetNumMonitors() {
+  // This query is kinda bogus for Linux -- do we want number of X screens?
+  // The number of monitors Xinerama has?  We'll just use whatever GDK uses.
+  GdkScreen* screen = gdk_screen_get_default();
+  return gdk_screen_get_n_monitors(screen);
+}
+
 }  // namespace gfx