[headless] Embed pak file into binary.

ui/base/resource/resource_bundle.h

Index: ui/base/resource/resource_bundle.h
diff --git a/ui/base/resource/resource_bundle.h b/ui/base/resource/resource_bundle.h
index cce0d8dbed02a4e4aaab0f9c049e31a34420745b..404e7965ec59701fc89d3c96bd49717692aa39b7 100644
--- a/ui/base/resource/resource_bundle.h
+++ b/ui/base/resource/resource_bundle.h
@@ -146,6 +146,7 @@ class UI_BASE_EXPORT ResourceBundle {
   // Returns true after the global resource loader instance has been created.
   static bool HasSharedInstance();
 
+  // Initialize the ResourceBundle using data pack from given buffer.
   // Return the global resource loader instance.
   static ResourceBundle& GetSharedInstance();
 
@@ -170,6 +171,10 @@ class UI_BASE_EXPORT ResourceBundle {
                                  const base::MemoryMappedFile::Region& region,
                                  ScaleFactor scale_factor);
 
+  // Same as above but using contents of the given buffer.
+  void AddDataPackFromBuffer(base::StringPiece buffer,
+                             ScaleFactor scale_factor);
+
   // Same as AddDataPackFromPath but does not log an error if the pack fails to
   // load.
   void AddOptionalDataPackFromPath(const base::FilePath& path,