Add support for Mac/iOS application bundles to GN tool.

tools/gn/command_format.cc

Index: tools/gn/command_format.cc
diff --git a/tools/gn/command_format.cc b/tools/gn/command_format.cc
index d7301c92613b6e698908a7b7d7d3173c58000d93..9ba11defca1ab053dc1e3d2d9788d41ca95fe172 100644
--- a/tools/gn/command_format.cc
+++ b/tools/gn/command_format.cc
@@ -308,7 +308,8 @@ void Printer::AnnotatePreferredMultilineAssignment(const BinaryOpNode* binop) {
     const base::StringPiece lhs = ident->value().value();
     if (lhs == "data" || lhs == "datadeps" || lhs == "data_deps" ||
         lhs == "deps" || lhs == "inputs" || lhs == "outputs" ||
-        lhs == "public" || lhs == "public_deps" || lhs == "sources") {
+        lhs == "public" || lhs == "public_deps" || lhs == "sources" ||
+        lhs == "bundle_data") {
       const_cast<ListNode*>(list)->set_prefer_multiline(true);
     }
   }