Refactored-out the code of thumbnaling algorithm from thumbnail_tab_helper.

chrome/browser/thumbnails/thumbnail_service_impl.h

Index: chrome/browser/thumbnails/thumbnail_service_impl.h
diff --git a/chrome/browser/thumbnails/thumbnail_service_impl.h b/chrome/browser/thumbnails/thumbnail_service_impl.h
index 13574bc655b5054a3edd6b103ef49922d031e0ea..0205aac60cf3685fb4a65bad9e0c4108d3fbbf1d 100644
--- a/chrome/browser/thumbnails/thumbnail_service_impl.h
+++ b/chrome/browser/thumbnails/thumbnail_service_impl.h
@@ -23,9 +23,9 @@ class ThumbnailServiceImpl : public ThumbnailService {
   explicit ThumbnailServiceImpl(Profile* profile);
 
   // Implementation of ThumbnailService.
-  virtual bool SetPageThumbnail(const GURL& url,
-                                const gfx::Image& thumbnail,
-                                const ThumbnailScore& score) OVERRIDE;
+  virtual bool SetPageThumbnail(const ThumbnailingContext& context,
+                                const gfx::Image& thumbnail) OVERRIDE;
+  virtual ThumbnailingAlgorithm* GetThumbnailingAlgorithm() const OVERRIDE;
   virtual bool GetPageThumbnail(
       const GURL& url,
       scoped_refptr<base::RefCountedMemory>* bytes) OVERRIDE;