Add scale factor tag to data packs

ui/base/resource/resource_bundle_linux.cc

Index: ui/base/resource/resource_bundle_linux.cc
diff --git a/ui/base/resource/resource_bundle_linux.cc b/ui/base/resource/resource_bundle_linux.cc
index 5c8d598d71d6e0a1bf1b5f27d103253966d0a03d..aa81a72366894fa40816e8cdcffa7428fa76e8b2 100644
--- a/ui/base/resource/resource_bundle_linux.cc
+++ b/ui/base/resource/resource_bundle_linux.cc
@@ -21,9 +21,14 @@ FilePath GetResourcesPakFilePath(const std::string& pak_name) {
 namespace ui {
 
 void ResourceBundle::LoadCommonResources() {
-  AddDataPack(GetResourcesPakFilePath("chrome.pak"));
-  AddDataPack(GetResourcesPakFilePath("theme_resources_standard.pak"));
-  AddDataPack(GetResourcesPakFilePath("ui_resources_standard.pak"));
+  AddDataPack(GetResourcesPakFilePath("chrome.pak"), 1.0);
+  AddDataPack(GetResourcesPakFilePath("theme_resources_standard.pak"), 1.0);
+  AddDataPack(GetResourcesPakFilePath("ui_resources_standard.pak"), 1.0);
+
+#if defined(ENABLE_HIDPI)
+  AddDataPack(GetResourcesPakFilePath("theme_resources_2x.pak"), 2.0);
+  AddDataPack(GetResourcesPakFilePath("ui_resources_2x.pak"), 2.0);
+#endif
 }
 
 }  // namespace ui