Remove screen dependency from font_render_params_linux

ui/views/widget/desktop_aura/desktop_screen_x11.cc

Index: ui/views/widget/desktop_aura/desktop_screen_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_screen_x11.cc b/ui/views/widget/desktop_aura/desktop_screen_x11.cc
index e71ae6a6a82bfd9344ec8ccfb51eeb3882e94cfa..6ffd94a3c896909e26a399f93b380d9123bd01e7 100644
--- a/ui/views/widget/desktop_aura/desktop_screen_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_screen_x11.cc
@@ -20,6 +20,7 @@
 #include "ui/display/util/x11/edid_parser_x11.h"
 #include "ui/events/platform/platform_event_source.h"
 #include "ui/gfx/display.h"
+#include "ui/gfx/font_render_params.h"
 #include "ui/gfx/geometry/point_conversions.h"
 #include "ui/gfx/geometry/size_conversions.h"
 #include "ui/gfx/native_widget_types.h"
@@ -107,9 +108,9 @@ DesktopScreenX11::DesktopScreenX11()
                    RROutputChangeNotifyMask |
                    RRCrtcChangeNotifyMask);
 
-    displays_ = BuildDisplaysFromXRandRInfo();
+    SetDisplaysInternal(BuildDisplaysFromXRandRInfo());
   } else {
-    displays_ = GetFallbackDisplayList();
+    SetDisplaysInternal(GetFallbackDisplayList());
   }
 }
 
@@ -366,11 +367,17 @@ std::vector<gfx::Display> DesktopScreenX11::BuildDisplaysFromXRandRInfo() {
 
 void DesktopScreenX11::ConfigureTimerFired() {
   std::vector<gfx::Display> old_displays = displays_;
-  displays_ = BuildDisplaysFromXRandRInfo();
-
+  SetDisplaysInternal(BuildDisplaysFromXRandRInfo());
   change_notifier_.NotifyDisplaysChanged(old_displays, displays_);
 }
 
+void DesktopScreenX11::SetDisplaysInternal(
+    const std::vector<gfx::Display>& displays) {
+  displays_ = displays;
+  gfx::SetFontRenderParamsDeviceScaleFactor(
+      GetPrimaryDisplay().device_scale_factor());
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 
 gfx::Screen* CreateDesktopScreen() {