Refactor ExtensionView to support a UI-less extension instance....

chrome/browser/extensions/extensions_service.h

 // Copyright (c) 2006-2008 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 CHROME_BROWSER_EXTENSIONS_EXTENSIONS_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSIONS_SERVICE_H_
 
 #include <string>
 #include <vector>
+#include <list>
 
 #include "base/file_path.h"
 #include "base/message_loop.h"
 #include "base/ref_counted.h"
 #include "base/task.h"
 #include "base/values.h"
 
 class Browser;
 class BrowsingInstance;
 class Extension;
+class ExtensionHost;
 class ExtensionView;
 class ExtensionsServiceBackend;
 class GURL;
 class Profile;
 class SiteInstance;
 class UserScriptMaster;
 typedef std::vector<Extension*> ExtensionList;
 
 // Interface for the frontend to implement. Typically, this will be
 // ExtensionsService, but it can also be a test harness.
@@ skipping 45 matching lines @@
   virtual void LoadExtension(const FilePath& extension_path);
   virtual void OnExtensionsLoaded(ExtensionList* extensions);
   virtual void OnExtensionInstalled(FilePath path, bool is_update);
 
   // Creates a new ExtensionView, grouping it in the appropriate SiteInstance
   // (and therefore process) based on the URL and profile.
   ExtensionView* CreateView(Extension* extension,
                             const GURL& url,
                             Browser* browser);
 
+  // Creates a new UI-less extension instance.  Like CreateView, but not
+  // displayed anywhere.
+  void CreateBackgroundHost(Extension* extension, const GURL& url);
+
   // Returns the SiteInstance that the given URL belongs to.
   SiteInstance* GetSiteInstanceForURL(const GURL& url);
 
   // The name of the file that the current active version number is stored in.
   static const char* kCurrentVersionFileName;
 
  private:
   // The name of the directory inside the profile where extensions are
   // installed to.
   static const char* kInstallDirectoryName;
@@ skipping 10 matching lines @@
   // The backend that will do IO on behalf of this instance.
   scoped_refptr<ExtensionsServiceBackend> backend_;
 
   // The user script master for this profile.
   scoped_refptr<UserScriptMaster> user_script_master_;
 
   // The BrowsingInstance shared by all extensions in this profile.  This
   // controls process grouping.
   scoped_refptr<BrowsingInstance> browsing_instance_;
 
+  // The list of running viewless background extensions.
+  typedef std::list<ExtensionHost*> ExtensionHostList;
+  ExtensionHostList background_hosts_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionsService);
 };
 
 // Implements IO for the ExtensionsService.
 // TODO(aa): Extract an interface out of this for testing the frontend, once the
 // frontend has significant logic to test.
 class ExtensionsServiceBackend
     : public base::RefCountedThreadSafe<ExtensionsServiceBackend> {
  public:
   explicit ExtensionsServiceBackend(const FilePath& install_directory)
@@ skipping 112 matching lines @@
   // The top-level extensions directory being installed to.
   FilePath install_directory_;
 
   // Whether errors result in noisy alerts.
   bool alert_on_error_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionsServiceBackend);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSIONS_SERVICE_H_