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Add logic to set FeaturePodsContainer Layout according to page numbers
Add PageIndicatorView in UnifiedSystemTrayView

The SystemTray will be limited to show 3x3 FeaturePodButtons at a time.
Additional Buttons will be added to additional pages.
The available pages will be signified by small buttons under the
feature pods container.

Bug: 914077
Change-Id: I8e2e1a51b0503bda251e409f7ce77d81f57f136e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1590610
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659728}