Add forward_variables_from() and target() to GN

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 691 matching lines @@
                                        is_target);
 
     INSERT_FUNCTION(Action, true)
     INSERT_FUNCTION(ActionForEach, true)
     INSERT_FUNCTION(Copy, true)
     INSERT_FUNCTION(Executable, true)
     INSERT_FUNCTION(Group, true)
     INSERT_FUNCTION(SharedLibrary, true)
     INSERT_FUNCTION(SourceSet, true)
     INSERT_FUNCTION(StaticLibrary, true)
+    INSERT_FUNCTION(Target, true)
 
     INSERT_FUNCTION(Assert, false)
     INSERT_FUNCTION(Config, false)
     INSERT_FUNCTION(DeclareArgs, false)
     INSERT_FUNCTION(Defined, false)
     INSERT_FUNCTION(ExecScript, false)
     INSERT_FUNCTION(ForEach, false)
+    INSERT_FUNCTION(ForwardVariablesFrom, false)
     INSERT_FUNCTION(GetEnv, false)
     INSERT_FUNCTION(GetLabelInfo, false)
     INSERT_FUNCTION(GetPathInfo, 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)
@@ skipping 33 matching lines @@
       if (err->has_error())
         return Value();
       return templ->Invoke(scope, function, args.list_value(), block, err);
     }
 
     *err = Err(name, "Unknown function.");
     return Value();
   }
 
   if (found_function->second.self_evaluating_args_runner) {
-    // Self evaluating args functions are special weird built-ins. Currently,
-    // only foreach() takes a block following it. Rather than force them all to
-    // check that they have a block or no block and risk bugs for new additions,
-    // check a whitelist here.
+    // Self evaluating args functions are special weird built-ins like foreach.
+    // Rather than force them all to check that they have a block or no block
+    // and risk bugs for new additions, check a whitelist here.
     if (found_function->second.self_evaluating_args_runner != &RunForEach) {
       if (!VerifyNoBlockForFunctionCall(function, block, err))
         return Value();
     }
     return found_function->second.self_evaluating_args_runner(
         scope, function, args_list, err);
   }
 
   // All other function types take a pre-executed set of args.
   Value args = args_list->Execute(scope, err);
@@ skipping 31 matching lines @@
   }
 
   // Otherwise it's a no-block function.
   if (!VerifyNoBlockForFunctionCall(function, block, err))
     return Value();
   return found_function->second.no_block_runner(scope, function,
                                                 args.list_value(), err);
 }
 
 }  // namespace functions