Makes loading test resources load the first supported scale factor

ui/base/resource/resource_bundle.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/resource_bundle.h"
 
 #include <limits>
 #include <vector>
 
 #include "base/big_endian.h"
@@ skipping 303 matching lines @@
     NOTREACHED();
     return std::string();
   }
 
   locale_resources_data_.reset(data_pack.release());
   return app_locale;
 }
 
 void ResourceBundle::LoadTestResources(const base::FilePath& path,
                                        const base::FilePath& locale_path) {
+  DCHECK(!ui::GetSupportedScaleFactors().empty());
+  const ScaleFactor scale_factor(ui::GetSupportedScaleFactors()[0]);
   // Use the given resource pak for both common and localized resources.
-  scoped_ptr<DataPack> data_pack(new DataPack(SCALE_FACTOR_100P));
+  scoped_ptr<DataPack> data_pack(new DataPack(scale_factor));
   if (!path.empty() && data_pack->LoadFromPath(path))
     AddDataPack(data_pack.release());
 
   data_pack.reset(new DataPack(ui::SCALE_FACTOR_NONE));
   if (!locale_path.empty() && data_pack->LoadFromPath(locale_path)) {
     locale_resources_data_.reset(data_pack.release());
   } else {
     locale_resources_data_.reset(new DataPack(ui::SCALE_FACTOR_NONE));
   }
 }
@@ skipping 515 matching lines @@
 // static
 bool ResourceBundle::DecodePNG(const unsigned char* buf,
                                size_t size,
                                SkBitmap* bitmap,
                                bool* fell_back_to_1x) {
   *fell_back_to_1x = PNGContainsFallbackMarker(buf, size);
   return gfx::PNGCodec::Decode(buf, size, bitmap);
 }
 
 }  // namespace ui