49737 Font subset in the tool (a: size, cla: yes, framework, team, tool, waiting for tree to go green)

49740 [flutter_tools] Make OperatingSystemUtils context-free (cla: yes, tool)

49743 Roll engine 4a55b4fd2500..6007c17fd246 (2 commits) (autoroller: commit, cla: yes)

49750 Use skia golden files in driver test (a: tests, cla: yes, framework, team)

49751 [fuchsia] Runs stocks driver test on Fuchsia NUCs in devicelab (CQ+1, cla: yes, team, waiting for tree to go green)

49756 Fix englishLike2018 bodyText (cla: yes, f: material design, framework)