Enable shrink rendering mode in layoutlib

In thid mode layoutlib creates a minimum possible image that contains
the required layout.

Bug: 136211522
Test: RenderTests.java
Change-Id: I50cfced2863229828bae4342a215af8587aca259
(cherry picked from commit 65025a9b933ba448fa1f4ee38b56aa4ba239afd3)
4 files changed