Add close callback to FeaturePromoController
This allows clients to supply a callback upon starting a promo. When the bubble closes, it will be called. No information is given in this CL. In the future, supplying a close reason is desirable. Bug: 1143465 Change-Id: I6a1af8d6f314cc268e67406371a5414cbc4feb6f Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508395Reviewed-by:Dana Fried <dfried@chromium.org> Commit-Queue: Collin Baker <collinbaker@chromium.org> Cr-Commit-Position: refs/heads/master@{#822789}
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