ShapeDetection: adding Exposed=(Window,Worker) to idls

Because they are missing as [1] mentions.

[1] https://bugs.chromium.org/p/chromium/issues/detail?id=665150#c10

BUG=665150

Review-Url: https://codereview.chromium.org/2546293002
Cr-Commit-Position: refs/heads/master@{#436199}
6 files changed