Add support for multiple zygote fork delegates

content/public/app/content_main_delegate.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_APP_CONTENT_MAIN_DELEGATE_H_
 #define CONTENT_PUBLIC_APP_CONTENT_MAIN_DELEGATE_H_
 
 #include <string>
 
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 
+template <typename>
+class ScopedVector;
+
 namespace content {
 
 class ContentBrowserClient;
 class ContentPluginClient;
 class ContentRendererClient;
 class ContentUtilityClient;
 class ZygoteForkDelegate;
 struct MainFunctionParams;
 
 class CONTENT_EXPORT ContentMainDelegate {
@@ skipping 35 matching lines @@
   // override this behavior.
   virtual bool ShouldSendMachPort(const std::string& process_type);
 
   // Allows the embedder to override initializing the sandbox. This is needed
   // because some processes might not want to enable it right away or might not
   // want it at all.
   virtual bool DelaySandboxInitialization(const std::string& process_type);
 
 #elif defined(OS_POSIX) && !defined(OS_ANDROID) && !defined(OS_IOS)
   // Tells the embedder that the zygote process is starting, and allows it to
-  // specify a zygote delegate if it wishes.
-  virtual ZygoteForkDelegate* ZygoteStarting();
+  // specify one or more zygote delegates if it wishes by storing them in
+  // |*delegates|.
+  virtual void ZygoteStarting(ScopedVector<ZygoteForkDelegate>* delegates);
 
   // Called every time the zygote process forks.
   virtual void ZygoteForked() {}
 #endif  // OS_MACOSX
 
  protected:
   friend class ContentClientInitializer;
 
   // Called once per relevant process type to allow the embedder to customize
   // content. If an embedder wants the default (empty) implementation, don't
   // override this.
   virtual ContentBrowserClient* CreateContentBrowserClient();
   virtual ContentPluginClient* CreateContentPluginClient();
   virtual ContentRendererClient* CreateContentRendererClient();
   virtual ContentUtilityClient* CreateContentUtilityClient();
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_APP_CONTENT_MAIN_DELEGATE_H_