Add support to extension_shell and ash_shell to use external V8 snapshot files.

extensions/shell/browser/shell_content_browser_client.h

 // 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.
 
 #ifndef EXTENSIONS_SHELL_BROWSER_SHELL_CONTENT_BROWSER_CLIENT_H_
 #define EXTENSIONS_SHELL_BROWSER_SHELL_CONTENT_BROWSER_CLIENT_H_
 
 #include "base/compiler_specific.h"
 #include "content/public/browser/content_browser_client.h"
 
@@ skipping 40 matching lines @@
   void SiteInstanceGotProcess(content::SiteInstance* site_instance) override;
   void SiteInstanceDeleting(content::SiteInstance* site_instance) override;
   void AppendExtraCommandLineSwitches(base::CommandLine* command_line,
                                       int child_process_id) override;
   content::SpeechRecognitionManagerDelegate*
   CreateSpeechRecognitionManagerDelegate() override;
   content::BrowserPpapiHost* GetExternalBrowserPpapiHost(
       int plugin_process_id) override;
   void GetAdditionalAllowedSchemesForFileSystem(
       std::vector<std::string>* additional_schemes) override;
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
+  void GetAdditionalMappedFilesForChildProcess(
+      const base::CommandLine& command_line,
+      int child_process_id,
+      content::FileDescriptorInfo* mappings) override;
+#endif
+
   content::DevToolsManagerDelegate* GetDevToolsManagerDelegate() override;
 
  protected:
   // Subclasses may wish to provide their own ShellBrowserMainParts.
   virtual ShellBrowserMainParts* CreateShellBrowserMainParts(
       const content::MainFunctionParams& parameters,
       ShellBrowserMainDelegate* browser_main_delegate);
 
  private:
   // Appends command line switches for a renderer process.
   void AppendRendererSwitches(base::CommandLine* command_line);
 
   // Returns the extension or app associated with |site_instance| or NULL.
   const Extension* GetExtension(content::SiteInstance* site_instance);
 
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
+  base::ScopedFD v8_natives_fd_;
+  base::ScopedFD v8_snapshot_fd_;
+#endif
+
   // Owned by content::BrowserMainLoop.
   ShellBrowserMainParts* browser_main_parts_;
 
   // Owned by ShellBrowserMainParts.
   ShellBrowserMainDelegate* browser_main_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellContentBrowserClient);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_SHELL_BROWSER_SHELL_CONTENT_BROWSER_CLIENT_H_