Fix Pango font rendering with HiDPi displays on Linux.

chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc

Index: chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc
diff --git a/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc b/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc
index be88def671a2eb3ece74927740a26b7915ed1424..420e43c47a93b3329e5e3deee2a026cdd65b368b 100644
--- a/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc
+++ b/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc
@@ -123,8 +123,12 @@ void ChromeBrowserMainExtraPartsAura::PreCreateThreads() {
   if (!chrome::ShouldOpenAshOnStartup())
 #endif
   {
-    gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE,
-                                   views::CreateDesktopScreen());
+    gfx::Screen* screen = views::CreateDesktopScreen();
+    gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, screen);
+#if defined(USE_X11)
+    views::LinuxUI::instance()->UpdateDeviceScaleFactor(
+        screen->GetPrimaryDisplay().device_scale_factor());
+#endif
   }
 #endif
 }