Add support for multi resolution icons

ui/base/resource/resource_bundle_posix.cc

Index: ui/base/resource/resource_bundle_posix.cc
diff --git a/ui/base/resource/resource_bundle_posix.cc b/ui/base/resource/resource_bundle_posix.cc
index 97747e072b1d21b14e10612547fe5d684310a614..d2fe55b66120168ddf510cb003f89a02b4b0d011 100644
--- a/ui/base/resource/resource_bundle_posix.cc
+++ b/ui/base/resource/resource_bundle_posix.cc
@@ -98,6 +98,14 @@ void ResourceBundle::LoadCommonResources() {
   CHECK(!resources_file_path.empty()) << "chrome.pak not found";
   resources_data_ = LoadResourcesDataPak(resources_file_path);
   CHECK(resources_data_) << "failed to load chrome.pak";
+
+  FilePath large_icon_resources_file_path = GetLargeIconResourcesFilePath();
+  if (!large_icon_resources_file_path.empty()) {
+    large_icon_resources_data_ =
+        LoadResourcesDataPak(large_icon_resources_file_path);
+    CHECK(large_icon_resources_data_) <<
+        "failed to load theme_resources_large.pak";
+  }
 }
 
 std::string ResourceBundle::LoadLocaleResources(