Avoid file IO on UI thread by moving more save-page-as stuff to the FILE thread.

content/browser/download/save_package.h

Index: content/browser/download/save_package.h
diff --git a/content/browser/download/save_package.h b/content/browser/download/save_package.h
index edc54841c8ef1c7017d7a0806c525d0b315c2e94..5cafea5461f9b093d7a41b9c99a0aca7aa06a1c1 100644
--- a/content/browser/download/save_package.h
+++ b/content/browser/download/save_package.h
@@ -303,9 +303,12 @@ class CONTENT_EXPORT SavePackage
   static GURL GetUrlToBeSaved(WebContents* web_contents);
 
   static base::FilePath CreateDirectoryOnFileThread(
+      const base::string16& title,
+      const GURL& page_url,
+      bool can_save_as_complete,
+      const std::string& mime_type,
       const base::FilePath& website_save_dir,
       const base::FilePath& download_save_dir,
-      const base::FilePath& suggested_filename,
       bool skip_dir_check);
   void ContinueGetSaveInfo(bool can_save_as_complete,
                            const base::FilePath& suggested_path);
@@ -335,7 +338,9 @@ class CONTENT_EXPORT SavePackage
 
   // Helper function for preparing suggested name for the SaveAs Dialog. The
   // suggested name is determined by the web document's title.
-  base::FilePath GetSuggestedNameForSaveAs(
+  static base::FilePath GetSuggestedNameForSaveAs(
+      const base::string16& title,
+      const GURL& page_url,
       bool can_save_as_complete,
       const std::string& contents_mime_type);