Use Skia's matchFamilyStyleCharacter API for font fallback

content/child/dwrite_font_proxy/dwrite_font_proxy_init_win.cc

 // Copyright 2015 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/child/dwrite_font_proxy/dwrite_font_proxy_init_win.h"
 
 #include <dwrite.h>
+#include <dwrite_2.h>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/debug/alias.h"
 #include "base/win/iat_patch_function.h"
 #include "base/win/windows_version.h"
 #include "content/child/dwrite_font_proxy/dwrite_font_proxy_win.h"
 #include "content/child/font_warmup_win.h"
 #include "skia/ext/fontmgr_default_win.h"
 #include "skia/ext/refptr.h"
@@ skipping 58 matching lines @@
   if (!g_font_collection) {
     if (g_sender_override) {
       mswr::MakeAndInitialize<DWriteFontCollectionProxy>(
           &g_font_collection, factory.Get(), base::Bind(&GetSenderOverride));
     } else {
       mswr::MakeAndInitialize<DWriteFontCollectionProxy>(&g_font_collection,
                                                          factory.Get(), sender);
     }
   }
 
-  skia::RefPtr<SkFontMgr> skia_font_manager = skia::AdoptRef(
-      SkFontMgr_New_DirectWrite(factory.Get(), g_font_collection.Get()));
+  // DirectWrite font fallback does not work if it is initialized after the
+  // sandbox starts.
+  mswr::ComPtr<IDWriteFactory2> factory2;
+  factory.As<IDWriteFactory2>(&factory2);  // QueryInterface
+  mswr::ComPtr<IDWriteFontFallback> font_fallback;
+  if (factory2.Get())
+    factory2->GetSystemFontFallback(&font_fallback);
+
+  skia::RefPtr<SkFontMgr> skia_font_manager =
+      skia::AdoptRef(SkFontMgr_New_DirectWrite(
+          factory.Get(), g_font_collection.Get(), font_fallback.Get()));
   blink::WebFontRendering::setSkiaFontManager(skia_font_manager.get());
 
   // Add an extra ref for SetDefaultSkiaFactory, which keeps a ref but doesn't
   // addref.
   skia_font_manager->ref();
   SetDefaultSkiaFactory(skia_font_manager.get());
 }
 
 void UninitializeDWriteFontProxy() {
   if (g_font_collection)
     g_font_collection->Unregister();
 }
 
 void SetDWriteFontProxySenderForTesting(IPC::Sender* sender) {
   g_sender_override = sender;
 }
 
 }  // namespace content