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This CL add an new API to CustomViewBinder#getPixelHeight which allow
each custom view can return their height individually. The height is
based on the layout file related to the custom view.

This CL also add padding before and after the divider line, and render
test for it.

Bug:1114611

Change-Id: I5e104dd5cdcdcf4acf20beeab6a682b4d4bba152
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387542
Commit-Queue: Gang Wu <gangwu@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Sinan Sahin <sinansahin@google.com>
Cr-Commit-Position: refs/heads/master@{#804388}