36460 Add images and update examples for top widgets: (cla: yes, d: api docs, d: examples, f: material design, framework)

36465 Use FlutterFeatures to configure web and desktop devices (cla: yes, tool)

36468 Fix test_widgets-windows not running tests (a: tests, cla: yes, framework, team, waiting for tree to go green)

36471 Enable bitcode compilation for AOT (cla: yes)

36481 Remove untested code (cla: yes, tool)

36482 Sped up shader warmup by only drawing on a 100x100 surface (cla: yes, framework)

36485 Add text border docs (a: typography, cla: yes, d: api docs, framework)