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We plan to use |task_id| in this CL: https://crrev.com/c/2131545

It is used to solve the issue (b/147770827) that the camera app
window launched by camera intent is independent to the caller
Android app. We plan to pass the |task_id| of the caller Android app
to Chrome, get that caller app window and launch camera app in a
window which is a child of the caller app window.

Bug: 980846
Test: Build successfully
Change-Id: If476dc7a9c0910e9fa07fe5395c0478ec94ccd66
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2131541
Commit-Queue: Wei Lee <wtlee@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: David Jacobo <djacobo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759167}