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

tools/gn/target_generator.cc

Index: tools/gn/target_generator.cc
diff --git a/tools/gn/target_generator.cc b/tools/gn/target_generator.cc
index 3734ea9c3424ccf82c7511268a6438b07d9ac259..bf9672d6159983370cc3cf06b2eed86b523dce7d 100644
--- a/tools/gn/target_generator.cc
+++ b/tools/gn/target_generator.cc
@@ -87,6 +87,10 @@ void TargetGenerator::GenerateTarget(Scope* scope,
   if (output_type == functions::kCopy) {
     CopyTargetGenerator generator(target.get(), scope, function_call, err);
     generator.Run();
+  } else if (output_type == functions::kCopyBundleData) {
+    CopyBundleDataTargetGenerator generator(
+        target.get(), scope, function_call, err);
+    generator.Run();
   } else if (output_type == functions::kAction) {
     ActionTargetGenerator generator(target.get(), scope, function_call,
                                     Target::ACTION, err);