Allow startup with missing V8 snapshot file.

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index eff374d1c72f409e37044a2475f8b31bc7bdbca1..cfeac8d05641547fd22d49ce501f664c0c79a359 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -270,6 +270,12 @@ class CONTENT_EXPORT ContentBrowserClient {
   virtual void AppendExtraCommandLineSwitches(base::CommandLine* command_line,
                                               int child_process_id) {}
 
+  // This is called on the process launching thread, when files that should be
+  // passed to the client have been opened.  It allows command line switches to
+  // be added to tell the client where to find its files.
+  virtual void AppendMappedFileCommandLineSwitches(
+      base::CommandLine* command_line) {}
+
   // Returns the locale used by the application.
   // This is called on the UI and IO threads.
   virtual std::string GetApplicationLocale();