55527 Animation sheet recorder (a: tests, cla: yes, framework, waiting for tree to go green, will affect goldens)

55531 [flutter_tools] set test directory base as additional root, allow running without index.html (cla: yes, tool)

55556 [flutter_tools] quality pass on Linux build (cla: yes, tool)

55560 Revert “Roll engine 8fff8da38da2..d2ec21221e29 (8 commits)” (cla: yes, engine)

55562 Roll engine d2ec21221e29..2b94311a7764 (5 commits) (cla: yes, waiting for tree to go green)

55564 [flutter_tools] support –enable-experiment in flutter test (cla: yes, team, tool)