[webapi] Integrate 27 tests for CSS3 animations

These tests come from https://github.com/w3c/csswg-test/tree/master/css-animations-1 (commit c8d51c8e22bc55c2735f161f685285bda828651a)

Impacted tests(approved): new 27, update 0, delete 0
Unit test platform: [Android]
Unit test result summary: pass 27, fail 0, block 0