GN documentation updates.

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 629 matching lines @@
     INSERT_FUNCTION(Component, true)
     INSERT_FUNCTION(Executable, true)
     INSERT_FUNCTION(Group, true)
     INSERT_FUNCTION(SharedLibrary, true)
     INSERT_FUNCTION(SourceSet, true)
     INSERT_FUNCTION(StaticLibrary, true)
     INSERT_FUNCTION(Test, true)
 
     INSERT_FUNCTION(Assert, false)
     INSERT_FUNCTION(Config, false)
-    INSERT_FUNCTION(Copy, false)
+    INSERT_FUNCTION(Copy, true)

[cjhopman, 2014/05/07 20:19:18]

nit: Move this up into the group of other target functions

     INSERT_FUNCTION(DeclareArgs, false)
     INSERT_FUNCTION(Defined, false)
     INSERT_FUNCTION(ExecScript, false)
     INSERT_FUNCTION(GetEnv, 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)
@@ skipping 72 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