55181 Add performance tests for the new gallery (cla: yes, perf: speed, severe: performance, team, waiting for tree to go green)

55187 [flutter_tools] migrate windows to assemble (cla: yes, tool)

55201 Migrating old Gallery to new Slider (cla: yes, f: material design, team)

55207 Roll engine 7ae7ff441935..189ec1e7c430 (6 commits) (cla: yes, waiting for tree to go green)

55212 [flutter_tools] fix type error in symbolize (cla: yes, tool, waiting for tree to go green)

55217 Roll engine 189ec1e7c430..a35f24e2d0e3 (1 commits) (cla: yes, waiting for tree to go green)