Type conversion fixes, tools/ edition.

tools/gn/trace.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/trace.h"
 
 #include <algorithm>
 #include <map>
 #include <sstream>
 #include <vector>
@@ skipping 202 matching lines @@
   out << std::endl;
   SummarizeFileExecs(file_execs, out);
   out << std::endl;
   SummarizeScriptExecs(script_execs, out);
   out << std::endl;
 
   // Generally there will only be one header check, but it's theoretically
   // possible for more than one to run if more than one build is going in
   // parallel. Just report the total of all of them.
   if (!check_headers.empty()) {
-    float check_headers_time = 0;
+    double check_headers_time = 0;
     for (const auto& cur : check_headers)
       check_headers_time += cur->delta().InMillisecondsF();
 
     out << "Header check time: (total time in ms, files checked)\n";
     out << base::StringPrintf(" %8.2f  %d\n",
                               check_headers_time, headers_checked);
   }
 
   return out.str();
 }
@@ skipping 78 matching lines @@
     }
     out << "}";
   }
 
   out << "]}";
 
   std::string out_str = out.str();
   base::WriteFile(file_name, out_str.data(),
                        static_cast<int>(out_str.size()));
 }