66736 [gallery] add linux and windows files to gallery example (cla: yes, team)

66745 move resampler to handlePointerEvent and fix complex_layout_android__scroll_smoothness with PointerEvent (a: tests, cla: yes, framework, team, waiting for tree to go green)

66836 Roll package:dds to 1.4.0 and update error handling (cla: yes, team, tool)

66849 Flutter 1.22.0-12.3.pre framework cherrypicks (a: tests, cla: yes, engine, f: cupertino, f: material design, framework, team, tool)

66941 Replace MockFile with memory file system files (cla: yes, team, tool)

66946 Replace MockCache with Cache.test() (cla: yes, team, tool)