Generate thumbnails in the browser process.

chrome/browser/tab_contents/tab_contents.h

Index: chrome/browser/tab_contents/tab_contents.h
diff --git a/chrome/browser/tab_contents/tab_contents.h b/chrome/browser/tab_contents/tab_contents.h
index ef6f259f71488f8576c95f9aae15b37e83131208..f935c6af9ac21d0efd9bf7de33f59b28ebd31bec 100644
--- a/chrome/browser/tab_contents/tab_contents.h
+++ b/chrome/browser/tab_contents/tab_contents.h
@@ -911,6 +911,9 @@ class TabContents : public PageNavigator,
   void GenerateKeywordIfNecessary(
       const ViewHostMsg_FrameNavigate_Params& params);
 
+  // Update the thumbnail of the given URL if necessary.
+  void UpdateThumbnailIfNecessary(const GURL& url);
+
   // TabSpecificContentSettings::Delegate implementation.
   virtual void OnContentSettingsAccessed(bool content_was_blocked);
 
@@ -980,9 +983,6 @@ class TabContents : public PageNavigator,
   virtual void UpdateEncoding(RenderViewHost* render_view_host,
                               const std::string& encoding);
   virtual void UpdateTargetURL(int32 page_id, const GURL& url);
-  virtual void UpdateThumbnail(const GURL& url,
-                               const SkBitmap& bitmap,
-                               const ThumbnailScore& score);
   virtual void UpdateInspectorSetting(const std::string& key,
                                       const std::string& value);
   virtual void ClearInspectorSettings();