Use physical pixels for display root ServerWindow.

services/ui/ws/display.cc

Index: services/ui/ws/display.cc
diff --git a/services/ui/ws/display.cc b/services/ui/ws/display.cc
index 175529ca5ff8bae80e57f2a5f5c47a8de629665b..340dfba1483e8596fea74bf9a638e73229f841e5 100644
--- a/services/ui/ws/display.cc
+++ b/services/ui/ws/display.cc
@@ -35,7 +35,7 @@ namespace ws {
 Display::Display(WindowServer* window_server,
                  const PlatformDisplayInitParams& platform_display_init_params)
     : window_server_(window_server), last_cursor_(mojom::Cursor::CURSOR_NULL) {
-  CreateRootWindow(platform_display_init_params.metrics.bounds.size());
+  CreateRootWindow(platform_display_init_params.metrics.pixel_size);
 
   // Pass the display root ServerWindow to PlatformDisplay.
   PlatformDisplayInitParams param_copy = platform_display_init_params;