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

tools/gn/variables.h

Index: tools/gn/variables.h
diff --git a/tools/gn/variables.h b/tools/gn/variables.h
index ee68bd527b1b5358c342b6d9e6c7e04acfb6e608..9525a3fe9c67a35e9eb5cc674e8ff9e1a5350a2b 100644
--- a/tools/gn/variables.h
+++ b/tools/gn/variables.h
@@ -91,6 +91,14 @@ extern const char kAssertNoDeps[];
 extern const char kAssertNoDeps_HelpShort[];
 extern const char kAssertNoDeps_Help[];
 
+extern const char kBundleData[];
+extern const char kBundleData_HelpShort[];
+extern const char kBundleData_Help[];
+
+extern const char kBundleDataFilter[];
+extern const char kBundleDataFilter_HelpShort[];
+extern const char kBundleDataFilter_Help[];
+
 extern const char kCflags[];
 extern const char kCflags_HelpShort[];
 extern const char* kCflags_Help;