[build] Introduce an embedder version string

src/log-utils.cc

 // Copyright 2009 the V8 project 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 "src/log-utils.h"
 
 #include "src/assert-scope.h"
 #include "src/base/platform/platform.h"
 #include "src/objects-inl.h"
 #include "src/string-stream.h"
@@ skipping 37 matching lines @@
     if (strcmp(log_file_name, kLogToConsole) == 0) {
       OpenStdout();
     } else if (strcmp(log_file_name, kLogToTemporaryFile) == 0) {
       OpenTemporaryFile();
     } else {
       OpenFile(log_file_name);
     }
 
     if (output_handle_ != nullptr) {
       Log::MessageBuilder msg(this);
-      msg.Append("v8-version,%d,%d,%d,%d,%d", Version::GetMajor(),
-                 Version::GetMinor(), Version::GetBuild(), Version::GetPatch(),
-                 Version::IsCandidate());
+      if (strlen(Version::GetEmbedder()) == 0) {
+        msg.Append("v8-version,%d,%d,%d,%d,%d", Version::GetMajor(),
+                   Version::GetMinor(), Version::GetBuild(),
+                   Version::GetPatch(), Version::IsCandidate());
+      } else {
+        msg.Append("v8-version,%d,%d,%d,%d,%s,%d", Version::GetMajor(),
+                   Version::GetMinor(), Version::GetBuild(),
+                   Version::GetPatch(), Version::GetEmbedder(),
+                   Version::IsCandidate());
+      }
       msg.WriteToLogFile();
     }
   }
 }
 
 
 void Log::OpenStdout() {
   DCHECK(!IsEnabled());
   output_handle_ = stdout;
 }
@@ skipping 164 matching lines @@
   const int written = log_->WriteToFile(log_->message_buffer_, pos_);
   if (written != pos_) {
     log_->stop();
     log_->logger_->LogFailure();
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8