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

tools/gn/ninja_target_writer.cc

Index: tools/gn/ninja_target_writer.cc
diff --git a/tools/gn/ninja_target_writer.cc b/tools/gn/ninja_target_writer.cc
index 6c5d12b05c020e52bc9f6aaa587363dae4165d82..9719f4ee2bcee0de6b02fd9051a03ccda2545e24 100644
--- a/tools/gn/ninja_target_writer.cc
+++ b/tools/gn/ninja_target_writer.cc
@@ -57,8 +57,12 @@ void NinjaTargetWriter::RunAndWriteFile(const Target* target) {
   std::stringstream file;
 
   // Call out to the correct sub-type of writer.
-  if (target->output_type() == Target::COPY_FILES) {
-    NinjaCopyTargetWriter writer(target, file);
+  if (target->output_type() == Target::COPY_FILES ||
+      target->output_type() == Target::COPY_BUNDLE_DATA) {
+    Toolchain::ToolType tool_type = target->output_type() == Target::COPY_FILES
+                                        ? Toolchain::TYPE_COPY
+                                        : Toolchain::TYPE_COPY_BUNDLE_DATA;
+    NinjaCopyTargetWriter writer(target, file, tool_type);
     writer.Run();
   } else if (target->output_type() == Target::ACTION ||
              target->output_type() == Target::ACTION_FOREACH) {