[DirectWrite] Set blink device scale factor

content/renderer/renderer_main_platform_delegate_win.cc

 // Copyright (c) 2012 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 "content/renderer/renderer_main_platform_delegate.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "base/win/scoped_comptr.h"
 #include "base/win/win_util.h"
 #include "base/win/windows_version.h"
 #include "content/common/sandbox_win.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/injection_test_win.h"
 #include "content/public/renderer/render_font_warmup_win.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/renderer/render_thread_impl.h"
 #include "sandbox/win/src/sandbox.h"
 #include "skia/ext/fontmgr_default_win.h"
 #include "skia/ext/vector_platform_device_emf_win.h"
 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
 #include "third_party/WebKit/public/web/win/WebFontRendering.h"
 #include "third_party/icu/source/i18n/unicode/timezone.h"
 #include "third_party/skia/include/ports/SkFontMgr.h"
 #include "third_party/skia/include/ports/SkTypeface_win.h"
+#include "ui/gfx/win/dpi.h"
 
 #ifdef ENABLE_VTUNE_JIT_INTERFACE
 #include "v8/src/third_party/vtune/v8-vtune.h"
 #endif
 
 #include <dwrite.h>
 
 namespace content {
 namespace {
 
@@ skipping 61 matching lines @@
 
     if (use_direct_write) {
       WarmupDirectWrite();
     } else {
       SkTypeface_SetEnsureLOGFONTAccessibleProc(SkiaPreCacheFont);
       skia::SetSkiaEnsureTypefaceCharactersAccessible(
           SkiaPreCacheFontCharacters);
     }
   }
   blink::WebFontRendering::setUseDirectWrite(use_direct_write);
+  blink::WebFontRendering::setDeviceScaleFactor(gfx::GetDPIScale());
   if (use_direct_write) {
     blink::WebRuntimeFeatures::enableSubpixelFontScaling(true);
   }
 }
 
 void RendererMainPlatformDelegate::PlatformUninitialize() {
 }
 
 bool RendererMainPlatformDelegate::EnableSandbox() {
   sandbox::TargetServices* target_services =
       parameters_.sandbox_info->target_services;
 
   if (target_services) {
     // Cause advapi32 to load before the sandbox is turned on.
     unsigned int dummy_rand;
     rand_s(&dummy_rand);
     // Warm up language subsystems before the sandbox is turned on.
     ::GetUserDefaultLangID();
     ::GetUserDefaultLCID();
 
     target_services->LowerToken();
     return true;
   }
   return false;
 }
 
 }  // namespace content