60336 Heavy Widget construction and destruction performance test (a: tests, cla: yes, team)

60345 Update AUTHORS with couple contributors. (cla: yes, waiting for tree to go green)

60350 Roll Engine from 22b099bc6366 to 559d93d97886 (3 revisions) (cla: yes, waiting for tree to go green)

60367 Do not return partial semantics from tester.getSemantics (a: tests, cla: yes, framework, waiting for tree to go green)

60379 Do not call Picture.toImage on web during shader warm-up (cla: yes, framework, waiting for tree to go green)

60381 Use ephemeral ports for iOS port forwarding (cla: yes, platform-ios, tool)