Pass data saver pref value into embedded worker

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 0cf89389b7476c3c277f3aa602dfc935814b07e7..6d6c07d76e59e13854060a8d259a9c0a73ca68c9 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -347,6 +347,8 @@ class CONTENT_EXPORT ContentBrowserClient {
                                   int render_process_id,
                                   int render_frame_id);
 
+  virtual bool IsDataSaverEnabled(BrowserContext* context);
+
   // Allow the embedder to control if the given cookie can be read.
   // This is called on the IO thread.
   virtual bool AllowGetCookie(const GURL& url,