Add GN function get_label_info

tools/gn/functions.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/functions.h"
 
 #include <iostream>
 
 #include "base/environment.h"
 #include "base/strings/string_util.h"
@@ skipping 634 matching lines @@
     INSERT_FUNCTION(SourceSet, true)
     INSERT_FUNCTION(StaticLibrary, true)
     INSERT_FUNCTION(Test, true)
 
     INSERT_FUNCTION(Assert, false)
     INSERT_FUNCTION(Config, false)
     INSERT_FUNCTION(DeclareArgs, false)
     INSERT_FUNCTION(Defined, false)
     INSERT_FUNCTION(ExecScript, false)
     INSERT_FUNCTION(GetEnv, false)
+    INSERT_FUNCTION(GetLabelInfo, false)
     INSERT_FUNCTION(GetTargetOutputs, false)
     INSERT_FUNCTION(Import, false)
     INSERT_FUNCTION(Print, false)
     INSERT_FUNCTION(ProcessFileTemplate, false)
     INSERT_FUNCTION(ReadFile, false)
     INSERT_FUNCTION(RebasePath, false)
     INSERT_FUNCTION(SetDefaults, false)
     INSERT_FUNCTION(SetDefaultToolchain, false)
     INSERT_FUNCTION(SetSourcesAssignmentFilter, false)
     INSERT_FUNCTION(Template, false)
@@ skipping 68 matching lines @@
     return found_function->second.executed_block_runner(
         function, args.list_value(), &block_scope, err);
   }
 
   // Otherwise it's a no-block function.
   return found_function->second.no_block_runner(scope, function,
                                                 args.list_value(), err);
 }
 
 }  // namespace functions