Load the resources for max scale factor first.

ui/base/resource/resource_bundle_unittest.cc

Index: ui/base/resource/resource_bundle_unittest.cc
diff --git a/ui/base/resource/resource_bundle_unittest.cc b/ui/base/resource/resource_bundle_unittest.cc
index 25e1748b599f2d9dfe43d97d46bec21aa71e2867..1e3c9edfba57f3c3006d76d3a9c1f5874bafe4e3 100644
--- a/ui/base/resource/resource_bundle_unittest.cc
+++ b/ui/base/resource/resource_bundle_unittest.cc
@@ -379,20 +379,31 @@ TEST_F(ResourceBundleImageTest, GetRawDataResource) {
 // 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 =
@@ -408,4 +419,20 @@ TEST_F(ResourceBundleImageTest, GetImageNamed) {
               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