61502 Update documentation for IntrinsicWidth & IntrinsicHeight (cla: yes, d: api docs, documentation, framework)

61503 Add defaults to showGeneralDialog() (cla: yes, framework)

61507 Android views using hybrid composition e2e driver test (cla: yes, team, waiting for tree to go green)

61509 Add a E2E based performance test case (a: tests, cla: yes, framework, team, waiting for tree to go green)

61513 [flutter_tools] Make flutter git upstream configurable (cla: yes, tool, waiting for tree to go green)

61516 Allow transparent barrierColor in showDialog methods (cla: yes, framework)

61517 [CONTRIBUTING.md] adds Contributing to Flutter article link (cla: yes, team, waiting for tree to go green)