[headless] Embed pak file into binary.

ui/base/resource/resource_bundle.cc

Index: ui/base/resource/resource_bundle.cc
diff --git a/ui/base/resource/resource_bundle.cc b/ui/base/resource/resource_bundle.cc
index d2e4c51de325a5826acf60bed572aa04649eabc9..10064e0b2c65d4cc89d2ce4f2bfa82737f29b929 100644
--- a/ui/base/resource/resource_bundle.cc
+++ b/ui/base/resource/resource_bundle.cc
@@ -269,6 +269,16 @@ void ResourceBundle::AddDataPackFromFile(base::File file,
                             scale_factor);
 }
 
+void ResourceBundle::AddDataPackFromBuffer(base::StringPiece buffer,
+                                           ScaleFactor scale_factor) {
+  std::unique_ptr<DataPack> data_pack(new DataPack(scale_factor));
+  if (data_pack->LoadFromBuffer(buffer)) {
+    AddDataPack(data_pack.release());
+  } else {
+    LOG(ERROR) << "Failed to load data pack from buffer";
+  }
+}
+
 void ResourceBundle::AddDataPackFromFileRegion(
     base::File file,
     const base::MemoryMappedFile::Region& region,