36893 Fix minor typos (cla: yes, framework)

36895 Mark splash test flaky until proved stable. (cla: yes, team)

36901 Run Gradle tests on Windows (a: build, cla: yes, team, tool)

36949 Remove stdout related to settings_aar.gradle (a: tests, cla: yes, t: flutter driver, team)

36955 Extract common PlatformView functionality: Painting and Semantics (a: platform-views, cla: yes, framework)

36956 Redo: Modal dismissed by any button (cla: yes, framework, waiting for tree to go green)

36963 Add margins to tooltips (cla: yes, f: material design, framework, severe: new feature)