Add ContentLoadingProgressBar support

ContentLoadingProgressBar allows developers to follow the policy for loading content
laid out in the style guide. The progress view will only show if MIN_DELAY
passes before the view is hidden. The progress view, if shown, will always
show for at least MIN_SHOW_TIME ms.

https://github.com/android/platform_frameworks_support/commit/befff92741b1f0629d9a9389a3889cca56d914a2

thanks @castorflex

Signed-off-by: hany <hany.alsamman@gmail.com>