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Currently the triggering of ContentCapture is unpredictable, it is
hard for us to get the unbiased result for the UserActivatedDelay
experiment.

This patch adds an ExperimentContentCaptureConsumer which triggers
the ContentCapture independently and is enabled by default.

The allow list check is moved to consumer if the experiment
is enabled.

As ContentCapture is potentially used for all Android versions,
we plan to run the experiment for all of them.

This mechanism will also be used for future experiments.

This patch hasn't supported multiple consumers yet.

Test: Added new tests and pass the existing tests

Bug: 1114819, 1119663
Change-Id: I72e0b991767329caec37080caae2d5c2a9068eaf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368104
Commit-Queue: Tao Bai <michaelbai@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801672}