If a change contains many more files than the default-shown number of
files (more than 1,000 files) the show-all button may briefly lock-up
the browser while they render. Thanks to I50da91908, the performance is
vastly improved, but can still cause the page to be briefly unresponsive
on extremely large changes.
With this change, a tooltip warns the user that clicking show-all may
cause brief unresponsiveness. Because the link may or may not have a
tooltip, GR-TOOLTIP-BEHAVIOR is upgraded to use configuration that is
not set at "attached" time.
Bug: Issue 5657
Change-Id: I850a63d5561576b2f9b33e347c583adfee2aa695
7dfa26e1c1