Merge "Add PageIndicator interface and custom PageIndicatorLine view." into ub-launcher3-calgary
am: ae00781428

* commit 'ae007814289a465be3df1ddca276e30f73460a97':
  Add PageIndicator interface and custom PageIndicatorLine view.

Change-Id: I5e541836b8628236e2cd91a7f3aa37c52ac70f06