High DPI support for themes: Raw images for NTP attribution and background

chrome/browser/themes/browser_theme_pack.h

 // Copyright (c) 2012 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_THEMES_BROWSER_THEME_PACK_H_
 #define CHROME_BROWSER_THEMES_BROWSER_THEME_PACK_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 200 matching lines @@
   // Returns a unique id to use to store the raw bitmap for |prs_id| at
   // |scale_factor| in memory.
   int GetRawIDByPersistentID(int prs_id, ui::ScaleFactor scale_factor) const;
 
   // Returns true if the |key| specifies a valid scale (e.g. "100") and
   // the corresponding scale factor is currently in use. If true, returns
   // the scale factor in |scale_factor|.
   bool GetScaleFactorFromManifestKey(const std::string& key,
                                      ui::ScaleFactor* scale_factor) const;
 
+  // Generates raw images for any missing scale from an available scale.
+  void GenerateRawImageForAllSupportedScales(int prs_id);
+
   // Data pack, if we have one.
   scoped_ptr<ui::DataPack> data_pack_;
 
   // All structs written to disk need to be packed; no alignment tricks here,
   // please.
 #pragma pack(push,1)
   // Header that is written to disk.
   struct BrowserThemePackHeader {
     // Numeric version to make sure we're compatible in the future.
     int32 version;
@@ skipping 47 matching lines @@
   // Cache of images created in BuildFromExtension(). Once the theme pack is
   // created, this cache should only be accessed on the file thread. There
   // should be no IDs in |image_memory_| that are in |images_on_file_thread_|
   // or vice versa.
   ImageCache images_on_file_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserThemePack);
 };
 
 #endif  // CHROME_BROWSER_THEMES_BROWSER_THEME_PACK_H_