Metro/HiDPI: Move 1x icons into separate pak file

ui/base/resource/resource_bundle_win.cc

Index: ui/base/resource/resource_bundle_win.cc
diff --git a/ui/base/resource/resource_bundle_win.cc b/ui/base/resource/resource_bundle_win.cc
index 7fcaaf6500857f6432fb21884765d2bfb074f6e8..b82af1436792de73756aaefb17edf3231b4917af 100644
--- a/ui/base/resource/resource_bundle_win.cc
+++ b/ui/base/resource/resource_bundle_win.cc
@@ -5,8 +5,10 @@
 #include "ui/base/resource/resource_bundle_win.h"
 
 #include "base/logging.h"
+#include "base/path_service.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/resource/resource_data_dll_win.h"
+#include "ui/base/win/dpi.h"
 
 namespace ui {
 
@@ -20,11 +22,33 @@ HINSTANCE GetCurrentResourceDLL() {
   return GetModuleHandle(NULL);
 }
 
+FilePath GetResourcesPakFilePath(const std::string& pak_name) {
+  FilePath path;
+  if (PathService::Get(base::DIR_MODULE, &path))
+    return path.AppendASCII(pak_name.c_str());
+  return FilePath();
+}
+
 }  // end anonymous namespace
 
 void ResourceBundle::LoadCommonResources() {
   // As a convenience, add the current resource module as a data packs.
   data_packs_.push_back(new ResourceDataDLL(GetCurrentResourceDLL()));
+
+  bool use_hidpi_pak = false;
+#if defined(ENABLE_HIDPI)
+  // If we're running in HiDPI mode then use the 2x resource for DPI greater
+  // than 1.5. Otherwise use the 1x resource.
+  use_hidpi_pak = ui::GetDPIScale() > 1.5;
+#endif
+
+  if (!use_hidpi_pak) {
+    AddDataPack(GetResourcesPakFilePath("theme_resources_standard.pak"));
+    AddDataPack(GetResourcesPakFilePath("ui_resources_standard.pak"));
+  } else {
+    AddDataPack(GetResourcesPakFilePath("theme_resources_2x.pak"));
+    AddDataPack(GetResourcesPakFilePath("ui_resources_2x.pak"));
+  }
 }
 
 void ResourceBundle::LoadTestResources(const FilePath& path) {