[vr] Bail on unhandled code points.

chrome/browser/android/vr_shell/textures/ui_texture.h

 // Copyright 2017 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 CHROME_BROWSER_ANDROID_VR_SHELL_TEXTURES_UI_TEXTURE_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_TEXTURES_UI_TEXTURE_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 60 matching lines @@
   static std::unique_ptr<gfx::RenderText> CreateRenderText(
       const base::string16& text,
       const gfx::FontList& font_list,
       SkColor color,
       TextAlignment text_alignment);
 
   void set_dirty() { dirty_ = true; }
 
   static bool IsRTL();
   static gfx::FontList GetDefaultFontList(int size);
-  static gfx::FontList GetFontList(int size, base::string16 text);
+  static bool GetFontList(int size,
+                          base::string16 text,
+                          gfx::FontList* font_list);
+  static void SetForceFontFallbackFailureForTesting(bool force);
 
  private:
   bool dirty_ = true;
 
   DISALLOW_COPY_AND_ASSIGN(UiTexture);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_TEXTURES_UI_TEXTURE_H_