patch from petermayo to fix GN dependency regeneration

tools/gn/scheduler.h

 // 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.
 
 #ifndef TOOLS_GN_SCHEDULER_H_
 #define TOOLS_GN_SCHEDULER_H_
 
 #include <map>
 
 #include "base/atomic_ref_count.h"
@@ skipping 38 matching lines @@
   // TODO(brettw) this is global rather than per-BuildSettings. If we
   // start using >1 build settings, then we probably want this to take a
   // BuildSettings object so we know the depdency on a per-build basis.
   // If moved, most of the Add/Get functions below should move as well.
   void AddGenDependency(const base::FilePath& file);
   std::vector<base::FilePath> GetGenDependencies() const;
 
   // Tracks calls to write_file for resolving with the unknown generated
   // inputs (see AddUnknownGeneratedInput below).
   void AddWrittenFile(const SourceFile& file);
+  std::vector<SourceFile> GetWrittenFiles() const;
 
   // Unknown generated inputs are files that a target declares as an input
   // in the output directory, but which aren't generated by any dependency.
   //
   // Some of these files will be files written by write_file and will be
   // GenDependencies (see AddWrittenFile above). There are OK and include
   // things like response files for scripts. Others cases will be ones where
   // the file is generated by a target that's not a dependency.
   //
   // In order to distinguish these two cases, the checking for these input
@@ skipping 46 matching lines @@
   std::vector<SourceFile> written_files_;
   std::multimap<SourceFile, const Target*> unknown_generated_inputs_;
 
   DISALLOW_COPY_AND_ASSIGN(Scheduler);
 };
 
 extern Scheduler* g_scheduler;
 
 #endif  // TOOLS_GN_SCHEDULER_H_