Select theme resources from ResourceBundle at requested scale factor.

ui/base/resource/data_pack.cc

 // 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.
 
 #include "ui/base/resource/data_pack.h"
 
 #include <errno.h>
 
 #include "base/file_util.h"
 #include "base/logging.h"
@@ skipping 127 matching lines @@
       UMA_HISTOGRAM_ENUMERATION("DataPack.Load", ENTRY_NOT_FOUND,
                                 LOAD_ERRORS_COUNT);
       mmap_.reset();
       return false;
     }
   }
 
   return true;
 }
 
+bool DataPack::HasResource(uint16 resource_id) const {
+  return !!bsearch(&resource_id, mmap_->data() + kHeaderLength, resource_count_,

[tony, 2012/05/11 21:22:03]

Nit: The !! isn't necessary unless you think it improves readability.

[flackr, 2012/05/11 21:59:07]

The win_rel try bot complained about casting void* to bool:
e:\b\build\slave\win\build\src\ui\base\resource\data_pack.cc(150) :error C2220:
warning treated as error - no 'object' file generated
e:\b\build\slave\win\build\src\ui\base\resource\data_pack.cc(150) : warning
C4800: 'void *' : forcing value to bool 'true' or 'false' (performance warning)

+                   sizeof(DataPackEntry), DataPackEntry::CompareById);
+}
+
 bool DataPack::GetStringPiece(uint16 resource_id,
                               base::StringPiece* data) const {
   // It won't be hard to make this endian-agnostic, but it's not worth
   // bothering to do right now.
 #if defined(__BYTE_ORDER)
   // Linux check
   COMPILE_ASSERT(__BYTE_ORDER == __LITTLE_ENDIAN,
                  datapack_assumes_little_endian);
 #elif defined(__BIG_ENDIAN__)
   // Mac check
@@ skipping 117 matching lines @@
       return false;
     }
   }
 
   file_util::CloseFile(file);
 
   return true;
 }
 
 }  // namespace ui