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This change reverts my previous attempt at sorting the reticle into the
list of UI elements. It turns out that this is more subtle than I'd
originally appreciated, and until we can come up with a robust approach
that avoids all artifacts, I'm reverting to a state where the reticle
consistently draws atop all UI elements.

Bug: 779692
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I185b70f4c0137a6513c67765c1696fe16f996352
Reviewed-on: https://chromium-review.googlesource.com/826431Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Ian Vollick <vollick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524156}