Support sharing of ContentMain and BrowserMain code with embedded use cases (try #3).

content/public/browser/browser_main_parts.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_BROWSER_MAIN_PARTS_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_MAIN_PARTS_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/browser_thread.h"
 
+class MessageLoop;
+
 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()") 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
@@ skipping 30 matching lines @@
  public:
   BrowserMainParts() {}
   virtual ~BrowserMainParts() {}
 
   virtual void PreEarlyInitialization() = 0;
 
   virtual void PostEarlyInitialization() = 0;
 
   virtual void PreMainMessageLoopStart() = 0;
 
+  // Return the main message loop object or NULL to use the default message
+  // loop object.
+  virtual MessageLoop* GetMainMessageLoop() = 0;
+
   virtual void PostMainMessageLoopStart() = 0;
 
   // Allows an embedder to do any extra toolkit initialization.
   virtual void ToolkitInitialized() = 0;
 
   // Called just before any child threads owned by the content
   // framework are created.
   //
   // The main message loop has been started at this point (but has not
   // been run), and the toolkit has been initialized. Returns the error code
@@ skipping 17 matching lines @@
   // stopped and destroyed.
   virtual void PostDestroyThreads() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserMainParts);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_MAIN_PARTS_H_