Add "sidebar" section to extension manifest:...

chrome/browser/sidebar/sidebar_container.h

 // Copyright (c) 2010 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_SIDEBAR_SIDEBAR_CONTAINER_H_
 #define CHROME_BROWSER_SIDEBAR_SIDEBAR_CONTAINER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
 #include "base/string16.h"
+#include "chrome/browser/extensions/image_loading_tracker.h"
 #include "chrome/browser/tab_contents/tab_contents_delegate.h"
 
 class BrowserWindow;
 class Profile;
 class RenderViewHost;
 class SkBitmap;
 class TabContents;
 
 ///////////////////////////////////////////////////////////////////////////////
 // SidebarContainer
 //
 //  Stores one particular sidebar state: sidebar's content, its content id,
 //  tab it is linked to, mini tab icon, title etc.
 //
 class SidebarContainer
-    : public TabContentsDelegate {
+    : public TabContentsDelegate,
+      private ImageLoadingTracker::Observer {
  public:
   // Interface to implement to listen for sidebar update notification.
   class Delegate {
    public:
     Delegate() {}
     virtual ~Delegate() {}
     virtual void UpdateSidebar(SidebarContainer* host) = 0;
    private:
     DISALLOW_COPY_AND_ASSIGN(Delegate);
   };
 
-  SidebarContainer(TabContents* tab, const std::string& content_id,
+  SidebarContainer(TabContents* tab,
+                   const std::string& content_id,
                    Delegate* delegate);
   virtual ~SidebarContainer();
 
   // Called right before destroying this sidebar.
   // Does all the necessary cleanup.
   void SidebarClosing();
 
+  // Sets default sidebar parameters, as specified in extension manifest.
+  void LoadDefaults();
+
   // Returns sidebar's content id.
   const std::string& content_id() const { return content_id_; }
 
   // Returns TabContents sidebar is linked to.
   TabContents* tab_contents() const { return tab_; }
 
   // Returns sidebar's TabContents.
   TabContents* sidebar_contents() const { return sidebar_contents_.get(); }
 
   // Accessor for the badge text.
@@ skipping 45 matching lines @@
   virtual void ActivateContents(TabContents* contents) {}
   virtual void DeactivateContents(TabContents* contents) {}
   virtual void LoadingStateChanged(TabContents* source) {}
   virtual void CloseContents(TabContents* source) {}
   virtual void MoveContents(TabContents* source, const gfx::Rect& pos) {}
   virtual bool IsPopup(const TabContents* source) const;
   virtual void URLStarredChanged(TabContents* source, bool starred) {}
   virtual void UpdateTargetURL(TabContents* source, const GURL& url) {}
   virtual void ToolbarSizeChanged(TabContents* source, bool is_animating) {}
 
+  // Overridden from ImageLoadingTracker::Observer.
+  virtual void OnImageLoaded(SkBitmap* image,
+                             ExtensionResource resource,
+                             int index);
+
+  // Returns an extension this sidebar belongs to.
+  const Extension* GetExtension() const;
+
   // Contents of the tab this sidebar is linked to.
   TabContents* tab_;
 
   // Sidebar's content id. There might be more than one sidebar liked to each
   // particular tab and they are identified by their unique content id.
   const std::string content_id_;
 
   // Sidebar update notification listener.
   Delegate* delegate_;
 
   // Sidebar contents.
   scoped_ptr<TabContents> sidebar_contents_;
 
   // Badge text displayed on the sidebar's mini tab.
   string16 badge_text_;
 
   // Icon displayed on the sidebar's mini tab.
   scoped_ptr<SkBitmap> icon_;
 
   // Sidebar's title, displayed as a tooltip for sidebar's mini tab.
   string16 title_;
 
+  bool navigate_to_default_url_on_expand_;

[Aaron Boodman, 2011/01/20 00:36:11]

Please add comments for these new fields.

[Aleksey Shlyapnikov, 2011/01/20 02:41:43]

Done.

+  bool use_default_icon_;
+
+  // The object that is waiting for the sidebar images loading to complete

[Aaron Boodman, 2011/01/20 00:36:11]

More accurate comment would be:

Helper to load icons from extension asynchronously

[Aleksey Shlyapnikov, 2011/01/20 02:41:43]

Done.

+  // asynchronously.
+  scoped_ptr<ImageLoadingTracker> image_loading_tracker_;
+
   DISALLOW_COPY_AND_ASSIGN(SidebarContainer);
 };
 
 #endif  // CHROME_BROWSER_SIDEBAR_SIDEBAR_CONTAINER_H_