67245 Roll Engine from 167f45cdd893 to b073d69b3c19 (2 revisions) (cla: yes, waiting for tree to go green)

67249 Add detection of drawer open and close in Scaffold widget as a callback method. (cla: yes, f: material design, framework, waiting for tree to go green)

67266 Roll Engine from b073d69b3c19 to 04a46cc6567a (1 revision) (cla: yes, waiting for tree to go green)

67272 Roll Engine from 04a46cc6567a to a8d7d97bef8c (2 revisions) (cla: yes, waiting for tree to go green)

67274 [flutter_tools] refactor local engine locator to its own class (cla: yes, tool)