Load the resources for max scale factor first.

ui/base/resource/resource_bundle_unittest.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 "base/base_paths.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
@@ skipping 361 matching lines @@
   // for both scale factor requests.
   EXPECT_EQ("this is id 6", resource_bundle->GetRawDataResourceForScale(6,
       SCALE_FACTOR_100P));
   EXPECT_EQ("this is id 6", resource_bundle->GetRawDataResourceForScale(6,
       SCALE_FACTOR_200P));
 }
 
 // Test requesting image reps at various scale factors from the image returned
 // via ResourceBundle::GetImageNamed().
 TEST_F(ResourceBundleImageTest, GetImageNamed) {
-  FilePath data_path = dir_path().Append(FILE_PATH_LITERAL("sample.pak"));
-  FilePath data_2x_path = dir_path().Append(FILE_PATH_LITERAL("sample_2x.pak"));
+  std::vector<ScaleFactor> supported_factors;
+  supported_factors.push_back(SCALE_FACTOR_100P);
+  supported_factors.push_back(SCALE_FACTOR_200P);
+  test::SetSupportedScaleFactors(supported_factors);
+  EXPECT_EQ(SCALE_FACTOR_200P, ui::GetMaxScaleFactor());
+
+  FilePath data_1x_path = dir_path().AppendASCII("sample_1x.pak");
+  FilePath data_2x_path = dir_path().AppendASCII("sample_2x.pak");
 
   // Create the pak files.
-  CreateDataPackWithSingleBitmap(data_path, 10);
+  CreateDataPackWithSingleBitmap(data_1x_path, 10);
   CreateDataPackWithSingleBitmap(data_2x_path, 20);
 
   // Load the regular and 2x pak files.
   ResourceBundle* resource_bundle = CreateResourceBundleWithEmptyLocalePak();
-  resource_bundle->AddDataPackFromPath(data_path, SCALE_FACTOR_100P);
+  resource_bundle->AddDataPackFromPath(data_1x_path, SCALE_FACTOR_100P);
   resource_bundle->AddDataPackFromPath(data_2x_path, SCALE_FACTOR_200P);
 
   gfx::ImageSkia* image_skia = resource_bundle->GetImageSkiaNamed(3);
 
+#if defined(OS_CHROMEOS)
+  // ChromeOS loads highest scale factor first.
+  EXPECT_EQ(ui::SCALE_FACTOR_200P, image_skia->image_reps()[0].scale_factor());
+#endif
+
   // Resource ID 3 exists in both 1x and 2x paks. Image reps should be
   // available for both scale factors in |image_skia|.
   gfx::ImageSkiaRep image_rep =
       image_skia->GetRepresentation(ui::SCALE_FACTOR_100P);
   EXPECT_EQ(ui::SCALE_FACTOR_100P, image_rep.scale_factor());
   image_rep = image_skia->GetRepresentation(ui::SCALE_FACTOR_200P);
   EXPECT_EQ(ui::SCALE_FACTOR_200P, image_rep.scale_factor());
 
   // The 1.4x pack was not loaded. Requesting the 1.4x resource should return
   // either the 1x or the 2x resource.
   image_rep = image_skia->GetRepresentation(ui::SCALE_FACTOR_140P);
   EXPECT_TRUE(image_rep.scale_factor() == ui::SCALE_FACTOR_100P ||
               image_rep.scale_factor() == ui::SCALE_FACTOR_200P);
 }
 
+TEST_F(ResourceBundleImageTest, FallbackToNone) {
+  FilePath data_default_path = dir_path().AppendASCII("sample.pak");
+
+  // Create the pak files.
+  CreateDataPackWithSingleBitmap(data_default_path, 10);
+
+    // Load the regular pak files only.
+  ResourceBundle* resource_bundle = CreateResourceBundleWithEmptyLocalePak();
+  resource_bundle->AddDataPackFromPath(data_default_path, SCALE_FACTOR_NONE);
+
+  gfx::ImageSkia* image_skia = resource_bundle->GetImageSkiaNamed(3);
+  EXPECT_EQ(1u, image_skia->image_reps().size());
+  EXPECT_EQ(ui::SCALE_FACTOR_100P,
+            image_skia->image_reps()[0].scale_factor());
+}
+
 }  // namespace ui