[linux] Allow font to use below 1.0f scale

chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.h"
 
 #include "base/run_loop.h"
 #include "chrome/browser/chrome_browser_main.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/themes/theme_service.h"
@@ skipping 66 matching lines @@
   gtk2_ui->SetNativeThemeOverride(base::Bind(&GetNativeThemeForWindow));
   views::LinuxUI::SetInstance(gtk2_ui);
 }
 
 void ChromeBrowserMainExtraPartsViewsLinux::ToolkitInitialized() {
   ChromeBrowserMainExtraPartsViews::ToolkitInitialized();
   views::LinuxUI::instance()->Initialize();
 }
 
 void ChromeBrowserMainExtraPartsViewsLinux::PreCreateThreads() {
+  // Update the device scale factor before initializing views
+  // because its display::Screen instance depends on it.
+  views::LinuxUI::instance()->UpdateDeviceScaleFactor();
   ChromeBrowserMainExtraPartsViews::PreCreateThreads();
-  views::LinuxUI::instance()->UpdateDeviceScaleFactor(
-      display::Screen::GetScreen()->GetPrimaryDisplay().device_scale_factor());
-
   views::X11DesktopHandler::get()->AddObserver(this);
 }
 
 void ChromeBrowserMainExtraPartsViewsLinux::OnWorkspaceChanged(
     const std::string& new_workspace) {
   BrowserList::MoveBrowsersInWorkspaceToFront(new_workspace);
 }