Use command line to signal whether a child process was passed V8 snapshot files via file descriptor

extensions/shell/browser/shell_content_browser_client.cc

 // Copyright 2014 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 "extensions/shell/browser/shell_content_browser_client.h"
 
 #include "base/command_line.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/site_instance.h"
@@ skipping 185 matching lines @@
                  extension->id(),
                  site_instance->GetProcess()->GetID(),
                  site_instance->GetId()));
 }
 
 void ShellContentBrowserClient::AppendExtraCommandLineSwitches(
     base::CommandLine* command_line,
     int child_process_id) {
   std::string process_type =
       command_line->GetSwitchValueASCII(::switches::kProcessType);
+
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
+#if defined(V8_USE_EXTERNAL_STARTUP_DATA)
+  if (process_type != ::switches::kZygoteProcess) {
+    command_line->AppendSwitch(::switches::kV8NativesPassedByFD);
+    command_line->AppendSwitch(::switches::kV8SnapshotPassedByFD);
+  }
+#endif  // V8_USE_EXTERNAL_STARTUP_DATA
+#endif  // OS_POSIX && !OS_MACOSX
+
   if (process_type == ::switches::kRendererProcess)
     AppendRendererSwitches(command_line);
 }
 
 content::SpeechRecognitionManagerDelegate*
 ShellContentBrowserClient::CreateSpeechRecognitionManagerDelegate() {
   return new speech::ShellSpeechRecognitionManagerDelegate();
 }
 
 content::BrowserPpapiHost*
@@ skipping 74 matching lines @@
 
 const Extension* ShellContentBrowserClient::GetExtension(
     content::SiteInstance* site_instance) {
   ExtensionRegistry* registry =
       ExtensionRegistry::Get(site_instance->GetBrowserContext());
   return registry->enabled_extensions().GetExtensionOrAppByURL(
       site_instance->GetSiteURL());
 }
 
 }  // namespace extensions