Infrastructure for reading V8's initial snapshot from external files

net/tools/tld_cleanup/tld_cleanup.cc

Index: net/tools/tld_cleanup/tld_cleanup.cc
diff --git a/net/tools/tld_cleanup/tld_cleanup.cc b/net/tools/tld_cleanup/tld_cleanup.cc
index d9731d8c631d428ab5cc9687a7b2166a9c9597a1..1698de868465d67ad3c4b5f16b641f2074078482 100644
--- a/net/tools/tld_cleanup/tld_cleanup.cc
+++ b/net/tools/tld_cleanup/tld_cleanup.cc
@@ -28,6 +28,9 @@
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+#include "gin/public/isolate_holder.h"
+#endif // V8_USE_EXTERNAL_STARTUP_DATA
 #include "base/i18n/icu_util.h"
 #include "base/logging.h"
 #include "base/path_service.h"
@@ -66,6 +69,10 @@ int main(int argc, const char* argv[]) {
 
   base::i18n::InitializeICU();
 
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+  gin::IsolateHolder::LoadV8Snapshot();
+#endif // V8_USE_EXTERNAL_STARTUP_DATA
+
   base::FilePath input_file;
   PathService::Get(base::DIR_SOURCE_ROOT, &input_file);
   input_file = input_file.Append(FILE_PATH_LITERAL("net"))