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The extra title of ClientControlledShellSurface can be sent before
Widget of it is created. This CL makes it remember the extra title and
apply it after Widget is created.

Bug: 1143236
Test: Enable the debug option and open any ARC app
Change-Id: I9d992e3febf6370f32d915174ed30f87ce13c9c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505351Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822126}