[Icons NTP] Refactoring: Moving FallbackIconService to components\favicon\core

components/favicon_base/fallback_icon_service.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 COMPONENTS_FAVICON_BASE_FALLBACK_ICON_SERVICE_H_
-#define COMPONENTS_FAVICON_BASE_FALLBACK_ICON_SERVICE_H_
-
-#include <string>
-#include <vector>
-
-#include "base/macros.h"
-
-class GURL;
-
-namespace gfx {
-class Canvas;
-}
-
-namespace favicon_base {
-
-struct FallbackIconStyle;
-
-// A service to provide methods to render fallback favicons.
-class FallbackIconService {
- public:
-  explicit FallbackIconService(const std::vector<std::string>& font_list);
-  ~FallbackIconService();
-
-  // Renders a fallback icon synchronously and returns the bitmap. Returns an
-  // empty std::vector on failure. |size| is icon width and height in pixels.
-  std::vector<unsigned char> RenderFallbackIconBitmap(
-      const GURL& icon_url,
-      int size,
-      const FallbackIconStyle& style);
-
- private:
-  // Renders a fallback icon on |canvas| at position (|x|, |y|). |size| is icon
-  // width and height in pixels.
-  void DrawFallbackIcon(const GURL& icon_url,
-                        int size,
-                        const FallbackIconStyle& style,
-                        gfx::Canvas* canvas);
-
-  std::vector<std::string> font_list_;
-
-  DISALLOW_COPY_AND_ASSIGN(FallbackIconService);
-};
-
-}  // namespace favicon_base
-
-#endif  // COMPONENTS_FAVICON_BASE_FALLBACK_ICON_SERVICE_H_