Implement direct write fallback proxy

content/child/dwrite_font_proxy/dwrite_font_proxy_win.h

 // 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.
 
 #ifndef CONTENT_CHILD_DWRITE_FONT_PROXY_DWRITE_FONT_PROXY_WIN_H_
 #define CONTENT_CHILD_DWRITE_FONT_PROXY_DWRITE_FONT_PROXY_WIN_H_
 
 #include <dwrite.h>
 #include <wrl.h>
 
@@ skipping 53 matching lines @@
                       IDWriteFontFileStream** font_file_stream) override;
 
   HRESULT STDMETHODCALLTYPE
   RuntimeClassInitialize(IDWriteFactory* factory, IPC::Sender* sender_override);
 
   void Unregister();
 
   bool LoadFamily(UINT32 family_index,
                   IDWriteFontCollection** containing_collection);
 
+  // Gets the family at the specified index with the expected name. This can be
+  // used to avoid an IPC call when both the index and family name are known.
+  bool GetFontFamily(UINT32 family_index,
+                     const base::string16& family_name,
+                     IDWriteFontFamily** font_family);
+
   bool LoadFamilyNames(UINT32 family_index, IDWriteLocalizedStrings** strings);
 
   bool CreateFamily(UINT32 family_index);
 
  private:
   IPC::Sender* GetSender();
 
   Microsoft::WRL::ComPtr<IDWriteFactory> factory_;
   std::vector<Microsoft::WRL::ComPtr<DWriteFontFamilyProxy>> families_;
   std::map<base::string16, UINT32> family_names_;
@@ skipping 33 matching lines @@
                    DWRITE_FONT_STYLE style,
                    IDWriteFontList** matching_fonts) override;
 
   HRESULT STDMETHODCALLTYPE
   RuntimeClassInitialize(DWriteFontCollectionProxy* collection, UINT32 index);
 
   bool GetFontFromFontFace(IDWriteFontFace* font_face, IDWriteFont** font);
 
   void SetName(const base::string16& family_name);
 
+  const base::string16& GetName();
+
   bool IsLoaded();
 
  protected:
   bool LoadFamily();
 
  private:
   UINT32 family_index_;
   base::string16 family_name_;
   Microsoft::WRL::ComPtr<DWriteFontCollectionProxy> proxy_collection_;
   Microsoft::WRL::ComPtr<IDWriteFontFamily> family_;
@@ skipping 57 matching lines @@
   RuntimeClassInitialize(const base::string16& file_name);
 
  private:
   base::MemoryMappedFile data_;
 
   DISALLOW_ASSIGN(FontFileStream);
 };
 
 }  // namespace content
 #endif  // CONTENT_CHILD_DWRITE_FONT_PROXY_DWRITE_FONT_PROXY_WIN_H_