Transfer v8 snapshot files as file descriptors to child processes on Posix

chrome/browser/chrome_content_browser_client.h

Index: chrome/browser/chrome_content_browser_client.h
diff --git a/chrome/browser/chrome_content_browser_client.h b/chrome/browser/chrome_content_browser_client.h
index 67b2dd0e266380ce34d301c363456d0b85181047..1a0575477a43d165ecf6d2c9ea1892c517a23dbb 100644
--- a/chrome/browser/chrome_content_browser_client.h
+++ b/chrome/browser/chrome_content_browser_client.h
@@ -336,6 +336,11 @@ class ChromeContentBrowserClient : public content::ContentBrowserClient {
   // created. It is used only the IO thread.
   prerender::PrerenderTracker* prerender_tracker_;
 
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
+  base::ScopedFD v8_natives_fd_;
+  base::ScopedFD v8_snapshot_fd_;
+#endif  // OS_POSIX && !OS_MACOSX
+
   // Vector of additional ChromeContentBrowserClientParts.
   // Parts are deleted in the reverse order they are added.
   std::vector<ChromeContentBrowserClientParts*> extra_parts_;