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This cl implementation allows the client to provide custom views to
styled label and set the horizontal alignment.

Features:
1. The client can provide any view.
2. The client can set the horizontal alignment.
3. All views in a line are center aligned.
4. The custom view is one unit, cannot be wrapped into different line.
5. If width is not wide for the custom view, the custom view will be cutoff.

bug.

Bug: 793414
Test: Tested with different views and layout. Examples are posted in the
Change-Id: Icf7d70da812c9e40362e20cbc30dc118cdf6d77b
Reviewed-on: https://chromium-review.googlesource.com/888543
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534200}