Write thumbnail to the database on SetPageThumbnail....

chrome/browser/history/top_sites.h

Index: chrome/browser/history/top_sites.h
===================================================================
--- chrome/browser/history/top_sites.h	(revision 48639)
+++ chrome/browser/history/top_sites.h	(working copy)
@@ -91,11 +91,12 @@
 
   ~TopSites();
 
-  // Called by the public SetPageThumbnail. Takes RefCountedBytes
-  // rather than a SkBitmap.
-  bool SetPageThumbnail(const GURL& url,
-                        const RefCountedBytes* thumbnail_data,
-                        const ThumbnailScore& score);
+  // Sets the thumbnail without writing to the database. Useful when
+  // reading last known top sites from the DB.
+  // Returns true if the thumbnail was set, false if the existing one is better.
+  bool SetPageThumbnailNoDB(const GURL& url,
+                            const RefCountedBytes* thumbnail_data,
+                            const ThumbnailScore& score);
 
   void StartQueryForMostVisited();