61668 Track used Android pointer IDs and reuse IDs after a pointer is released (cla: yes, framework, waiting for tree to go green)

61671 Add no-op callbacks to platform view gesture recognizer when necessary (cla: yes, framework)

61672 Remove TODO around deprecation (cla: yes, framework, waiting for tree to go green)

61710 Added expandedHeight in flexibleSpace and flexibleSpaceBar (cla: yes, d: api docs, documentation, f: material design, framework, waiting for tree to go green)

61714 Implement customizable cursor height (cla: yes, f: cupertino, f: material design, framework, waiting for tree to go green)

61752 Allowed specifying reverseTransitionDuration in PageRouteBuilder class (cla: yes, f: routes, framework, waiting for tree to go green)