Add runtime dependency extraction for GN.

tools/gn/command_gen.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 "base/atomicops.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/timer/elapsed_timer.h"
 #include "tools/gn/build_settings.h"
 #include "tools/gn/commands.h"
 #include "tools/gn/ninja_target_writer.h"
 #include "tools/gn/ninja_writer.h"
+#include "tools/gn/runtime_deps.h"
 #include "tools/gn/scheduler.h"
 #include "tools/gn/setup.h"
 #include "tools/gn/standard_out.h"
 #include "tools/gn/switches.h"
 #include "tools/gn/target.h"
 
 namespace commands {
 
 namespace {
 
@@ skipping 70 matching lines @@
 
   Err err;
   // Write the root ninja files.
   if (!NinjaWriter::RunAndWriteFiles(&setup->build_settings(),
                                      setup->builder(),
                                      &err)) {
     err.PrintToStdout();
     return 1;
   }
 
+  if (!WriteRuntimeDepsFilesIfNecessary(*setup->builder(), &err)) {
+    err.PrintToStdout();
+    return 1;
+  }
+
   base::TimeDelta elapsed_time = timer.Elapsed();
 
   if (!base::CommandLine::ForCurrentProcess()->HasSwitch(switches::kQuiet)) {
     OutputString("Done. ", DECORATION_GREEN);
 
     std::string stats = "Wrote " +
         base::IntToString(static_cast<int>(write_counter)) +
         " targets from " +
         base::IntToString(
             setup->scheduler().input_file_manager()->GetInputFileCount()) +
         " files in " +
         base::Int64ToString(elapsed_time.InMilliseconds()) + "ms\n";
     OutputString(stats);
   }
 
   return 0;
 }
 
 }  // namespace commands