[Mac/GN] Treat create_bundle as a leaf for `gn desc runtime_deps`.

tools/gn/bundle_data.h

Index: tools/gn/bundle_data.h
diff --git a/tools/gn/bundle_data.h b/tools/gn/bundle_data.h
index 9a2ea0790841fbb9aa27d04a5cb762109dae04c7..3a1ce95ab7c10d4a33b475fd01463180b90a57bd 100644
--- a/tools/gn/bundle_data.h
+++ b/tools/gn/bundle_data.h
@@ -77,6 +77,9 @@ class BundleData {
   // of its contents.
   SourceFile GetBundleRootDirOutput(const Settings* settings) const;
 
+  // Performs GetBundleRootDirOutput but returns the result as a directory.
+  SourceDir GetBundleRootDirOutputAsDir(const Settings* settings) const;
+
   // Returns the list of inputs for the compilation of the asset catalog.
   SourceFiles& asset_catalog_sources() { return asset_catalog_sources_; }
   const SourceFiles& asset_catalog_sources() const {