Support in-browser thumbnailing on Windows XP.

chrome/browser/tab_contents/thumbnail_generator.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 CHROME_BROWSER_TAB_CONTENTS_THUMBNAIL_GENERATOR_H_
 #define CHROME_BROWSER_TAB_CONTENTS_THUMBNAIL_GENERATOR_H_
 
 #include <map>
 #include <utility>
 #include <vector>
@@ skipping 126 matching lines @@
       content::RenderWidgetHost* widget,
       int tag,
       const gfx::Size& size);
 
   // Asynchronously updates the thumbnail of the given tab. This must be called
   // on the UI thread.
   void AsyncUpdateThumbnail(content::WebContents* web_contents);
 
   // Called when the bitmap for generating a thumbnail is ready after the
   // AsyncUpdateThumbnail invocation. This runs on the UI thread.
-  void AsyncUpdateThumbnailFinish(
+  void UpdateThumbnailWithBitmap(
+      base::WeakPtr<content::WebContents> web_contents,

[brettw, 2012/07/12 19:20:26]

Can you pass this weak ptr by const ref? Otherwise the copy will have to involve
a bunch of bookkeeping.

[mazda, 2012/07/12 21:23:25]

Done.

+      const SkBitmap& bitmap);
+
+  // Called when the canvas for generating a thumbnail is ready after the
+  // AsyncUpdateThumbnail invocation. This runs on the UI thread.
+  void UpdateThumbnailWithCanvas(
       base::WeakPtr<content::WebContents> web_contents,

[brettw, 2012/07/12 19:20:26]

Ditto for const ref.

[mazda, 2012/07/12 21:23:25]

Done.

       skia::PlatformCanvas* temp_canvas,
       bool result);
 
   // content::NotificationObserver interface.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Indicates that the given widget has changed is visibility.
   void WidgetHidden(content::RenderWidgetHost* widget);
@@ skipping 14 matching lines @@
   bool load_interrupted_;
 
   base::WeakPtrFactory<ThumbnailGenerator> weak_factory_;
   scoped_ptr<base::WeakPtrFactory<content::WebContents> >
       web_contents_weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ThumbnailGenerator);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_THUMBNAIL_GENERATOR_H_