Add ChromeBrowserMainExtraParts for non main parts.

content/public/browser/browser_main_parts.h

 // Copyright (c) 2011 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_BROWSER_MAIN_PARTS_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_MAIN_PARTS_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 // This class contains different "stages" to be executed by |BrowserMain()|,
 // Each stage is represented by a single BrowserMainParts method, called from
 // the corresponding method in |BrowserMainLoop| (e.g., EarlyInitialization())
 // which does the following:
-//  - calls a method (e.g., "PreEarlyInitialization()") for each member of
-//    |parts_|. Parts will implement platform or tookit specific code for that
-//    stage.
+//  - calls a method (e.g., "PreEarlyInitialization()") which implements
+//    platform / tookit specific code for that stage.
 //  - calls various methods for things common to all platforms (for that stage).
 //  - calls a method (e.g., "PostEarlyInitialization()") for platform-specific
 //    code to be called after the common code.
 //
 // Stages:
 //  - EarlyInitialization: things which should be done as soon as possible on
 //    program start (such as setting up signal handlers) and things to be done
 //    at some generic time before the start of the main message loop.
 //  - MainMessageLoopStart: things beginning with the start of the main message
 //    loop and ending with initialization of the main thread; platform-specific
@@ skipping 11 matching lines @@
 //    from one of the platform-specific |Pre/Post...()| methods; do this if the
 //    code is unique to a platform type. Or (2) execute it from one of the
 //    "parts" (e.g., |EarlyInitialization()|) and provide platform-specific
 //    implementations of your code (in a virtual method); do this if you need to
 //    provide different implementations across most/all platforms.
 //  - Unless your new code is just one or two lines, put it into a separate
 //    method with a well-defined purpose. (Likewise, if you're adding to an
 //    existing chunk which makes it longer than one or two lines, please move
 //    the code out into a separate method.)
 //
-// There can be any number of "Parts". These should be constructed in
-// ContentBrowserClient::CreateBrowserMainParts. Each stage will be called
-// for each part in the order it was added. Destruction is in the inverse order.
 class CONTENT_EXPORT BrowserMainParts {
  public:
   BrowserMainParts() {}
   virtual ~BrowserMainParts() {}
 
   virtual void PreEarlyInitialization() = 0;
 
   virtual void PostEarlyInitialization() = 0;
 
   virtual void PreMainMessageLoopStart() = 0;
 
+  virtual void PostMainMessageLoopStart() = 0;
+
   // Allows an embedder to do any extra toolkit initialization.
   virtual void ToolkitInitialized() = 0;
 
-  virtual void PostMainMessageLoopStart() = 0;
-
   virtual void PreMainMessageLoopRun() = 0;
 
   // Returns true if the message loop was run, false otherwise.
+  // If this returns false, the default implementation will be run.
   // May set |result_code|, which will be returned by |BrowserMain()|.
-  // If no BrowserMainParts implementations return true, the default
-  // implementation will be run.
   virtual bool MainMessageLoopRun(int* result_code) = 0;
 
   virtual void PostMainMessageLoopRun() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserMainParts);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_MAIN_PARTS_H_