Don't get tab id until tab window handle is ready.
Don't get tab id until tab window handle is ready.

There are rare cases where the executor manager will DCHECK that the window handle that we ask it to associate to our tab id doesn't have a valid IEFrame parent. This is because we send the request for id <-> handle association before the handle is completely ready... So wait until the tab window handle is valid before sending a mapping event.

BUG=None yet... crbug down for maintenance :-(
TEST=None

Review URL: http://codereview.chromium.org/5632004

git-svn-id: http://src.chromium.org/svn/trunk/src@68607 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 8f90bf9580f7661686c54bba37472a567a05267f
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser