14145 Fix firefox detection to fix app startup for other browsers (cla: yes)

14146 Raise API level for reportFullyDrawn (cla: yes)

14147 v1.12.13+hotfix.3 cherry-picks (cla: yes)

14148 [web] [tests] Changing configurations for firefox (cla: yes)

14149 Do not paint a layer’s children if the children were not prerolled (cla: yes)

14151 Roll src/third_party/skia 0af13b3caf03..cc92b27c78a0 (26 commits) (autoroller: commit, cla: yes)