Misc truncation fixes for gn builds with VS 2015

chrome/test/chromedriver/util.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 "chrome/test/chromedriver/util.h"
 
 #include "base/base64.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 286 matching lines @@
     DataOutputStream stream;
     stream.WriteUInt32(kFileHeaderSignature);
     stream.WriteUInt16(version_needed);
     stream.WriteUInt16(bit_flag);
     stream.WriteUInt16(compression_method);
     stream.WriteUInt16(mod_time);
     stream.WriteUInt16(mod_date);
     stream.WriteUInt32(crc);
     stream.WriteUInt32(compressed_data.length());
     stream.WriteUInt32(uncompressed_size);
-    stream.WriteUInt16(name.length());
-    stream.WriteUInt16(fields.length());
+    stream.WriteUInt16(base::checked_cast<uint16>(name.length()));
+    stream.WriteUInt16(base::checked_cast<uint16>(fields.length()));
     stream.WriteString(name);
     stream.WriteString(fields);
     stream.WriteString(compressed_data);
     uint32 entry_size = stream.buffer().length();
 
     // Write central directory.
     stream.WriteUInt32(kCentralDirSignature);
     stream.WriteUInt16(0x14);  // Version made by. Unused at version 0.
     stream.WriteUInt16(version_needed);
     stream.WriteUInt16(bit_flag);
     stream.WriteUInt16(compression_method);
     stream.WriteUInt16(mod_time);
     stream.WriteUInt16(mod_date);
     stream.WriteUInt32(crc);
     stream.WriteUInt32(compressed_data.length());
     stream.WriteUInt32(uncompressed_size);
-    stream.WriteUInt16(name.length());
-    stream.WriteUInt16(fields.length());
+    stream.WriteUInt16(base::checked_cast<uint16>(name.length()));
+    stream.WriteUInt16(base::checked_cast<uint16>(fields.length()));
     stream.WriteUInt16(0);  // Comment length.
     stream.WriteUInt16(0);  // Disk number where file starts.
     stream.WriteUInt16(0);  // Internal file attr.
     stream.WriteUInt32(0);  // External file attr.
     stream.WriteUInt32(0);  // Offset to file.
     stream.WriteString(name);
     stream.WriteString(fields);
     uint32 cd_size = stream.buffer().length() - entry_size;
 
     // End of central directory.
@@ skipping 95 matching lines @@
       if (session->chrome) {
         const BrowserInfo* browser_info = session->chrome->GetBrowserInfo();
         status.AddDetails("Session info: " + browser_info->browser_name + "=" +
                           browser_info->browser_version);
       }
       return status;
     }
   }
   return Status(kOk);
 }