[vr] Bail on unhandled code points.

chrome/browser/android/vr_shell/textures/url_bar_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_URL_BAR_TEXTURE_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_TEXTURES_URL_BAR_TEXTURE_H_
 
 #include <memory>
 #include <vector>
 
+#include "base/callback.h"
 #include "base/macros.h"
 #include "chrome/browser/android/vr_shell/textures/ui_texture.h"
 #include "url/gurl.h"
 
 namespace gfx {
 class PointF;
 class RenderText;
 }  // namespace gfx
 
 namespace vr_shell {
 
 class UrlBarTexture : public UiTexture {
  public:
   enum DrawFlags {
     FLAG_BACK_HOVER = 1 << 0,
     FLAG_BACK_DOWN = 1 << 1,
   };
 
-  UrlBarTexture();
+  explicit UrlBarTexture(const base::Callback<void()>& failure_callback);
   ~UrlBarTexture() override;
   gfx::Size GetPreferredTextureSize(int width) const override;
   gfx::SizeF GetDrawnSize() const override;
 
   void SetURL(const GURL& gurl);
   void SetSecurityLevel(int level);
 
   bool HitsBackButton(const gfx::PointF& position) const;
   bool HitsUrlBar(const gfx::PointF& position) const;
 
   void SetHovered(bool hovered);
   void SetPressed(bool pressed);
 
  private:
   void Draw(SkCanvas* canvas, const gfx::Size& texture_size) override;
   float ToPixels(float meters) const;
   bool HitsTransparentRegion(const gfx::PointF& meters, bool left) const;
 
   gfx::SizeF size_;
   int security_level_;
   bool hovered_ = false;
   bool pressed_ = false;
   GURL gurl_;
   GURL last_drawn_gurl_;
   std::vector<std::unique_ptr<gfx::RenderText>> gurl_render_texts_;
+  base::Callback<void()> failure_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(UrlBarTexture);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_TEXTURES_URL_BAR_TEXTURE_H_