Allow startup with missing V8 snapshot file.

content/public/browser/content_browser_client.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 252 matching lines @@
 
   // See CharacterEncoding's comment.
   virtual std::string GetCanonicalEncodingNameByAliasName(
       const std::string& alias_name);
 
   // Allows the embedder to pass extra command line flags.
   // switches::kProcessType will already be set at this point.
   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();
 
   // Returns the languages used in the Accept-Languages HTTP header.
   // (Not called GetAcceptLanguages so it doesn't clash with win32).
   virtual std::string GetAcceptLangs(BrowserContext* context);
 
   // Returns the default favicon.  The callee doesn't own the given bitmap.
   virtual const gfx::ImageSkia* GetDefaultFavicon();
@@ skipping 345 matching lines @@
   // Allows an embedder to provide its own ExternalVideoSurfaceContainer
   // implementation.  Return nullptr to disable external surface video.
   virtual ExternalVideoSurfaceContainer*
   OverrideCreateExternalVideoSurfaceContainer(WebContents* web_contents);
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_