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

tools/gn/copy_target_generator.h

Index: tools/gn/copy_target_generator.h
diff --git a/tools/gn/copy_target_generator.h b/tools/gn/copy_target_generator.h
index 81fbb69e8e74ef931faf6699bb0e42c8038a8601..8716d0c56c5481bc258ec3f2c0686f447e3b7eeb 100644
--- a/tools/gn/copy_target_generator.h
+++ b/tools/gn/copy_target_generator.h
@@ -26,5 +26,22 @@ class CopyTargetGenerator : public TargetGenerator {
   DISALLOW_COPY_AND_ASSIGN(CopyTargetGenerator);
 };
 
+class CopyBundleDataTargetGenerator : public TargetGenerator {
+ public:
+  CopyBundleDataTargetGenerator(Target* target,
+                                Scope* scope,
+                                const FunctionCallNode* function_call,
+                                Err* err);
+  ~CopyBundleDataTargetGenerator() override;
+
+ protected:
+  void DoRun() override;
+
+ private:
+  void FillDestDir();
+
+  DISALLOW_COPY_AND_ASSIGN(CopyBundleDataTargetGenerator);
+};
+
 #endif  // TOOLS_GN_COPY_TARGET_GENERATOR_H_