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This module does not have actual tests yet.

Notable changes:
 - add ios_chrome_ui_eg2tests_module module
 - add ios_chrome_ui_eg2tests_module to ios/chrome/test/earl_grey2:all_tests
   target

This CL follows the same pattern as https://crrev.com/c/1628171

Bug: 866147
Change-Id: Iaac2b480054e221e8b3b9b8a8b07292608e27742
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636483Reviewed-by: Mohammad Refaat <mrefaat@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664864}