Implement direct write fallback proxy

content/test/dwrite_font_fake_sender_win.h

Index: content/test/dwrite_font_fake_sender_win.h
diff --git a/content/test/dwrite_font_fake_sender_win.h b/content/test/dwrite_font_fake_sender_win.h
index d2929a23c567716d5b3416520bdca56c2a603f9a..84363cb1ca863f59ba6083d0c1eeff0c4eb0196f 100644
--- a/content/test/dwrite_font_fake_sender_win.h
+++ b/content/test/dwrite_font_fake_sender_win.h
@@ -19,6 +19,9 @@
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_sender.h"
 
+struct DWriteFontStyle;
+struct MapCharactersResult;
+
 namespace content {
 
 class FakeFontCollection;
@@ -47,6 +50,8 @@ class FakeFont {
     return *this;
   }
 
+  const base::string16& font_name() { return font_name_; }
+
  private:
   friend FakeFontCollection;
   base::string16 font_name_;
@@ -114,6 +119,13 @@ class FakeFontCollection : public base::RefCounted<FakeFontCollection> {
     void OnGetFontFiles(uint32_t family_index,
                         std::vector<base::string16>* file_paths_);
 
+    void OnMapCharacters(const base::string16& text,
+                         const DWriteFontStyle& font_style,
+                         const base::string16& locale_name,
+                         uint32_t reading_direction,
+                         const base::string16& base_family_name,
+                         MapCharactersResult* result);
+
    private:
     scoped_refptr<FakeFontCollection> collection_;
     std::unique_ptr<IPC::Message> reply_;
@@ -148,6 +160,13 @@ class FakeFontCollection : public base::RefCounted<FakeFontCollection> {
   void OnGetFontFiles(uint32_t family_index,
                       std::vector<base::string16>* file_paths);
 
+  void OnMapCharacters(const base::string16& text,
+                       const DWriteFontStyle& font_style,
+                       const base::string16& locale_name,
+                       uint32_t reading_direction,
+                       const base::string16& base_family_name,
+                       MapCharactersResult* result);
+
   std::unique_ptr<ReplySender> GetReplySender();
 
  private: