33355 Compatibility pass on flutter/rendering tests for JavaScript compilation. (5) (a: tests, cla: yes, ☸ platform-web)

33359 Compatibility pass on flutter/physics tests for JavaScript compilation. (6) (a: tests, cla: yes, ☸ platform-web)

33360 Compatibility pass on flutter/semantics tests for JavaScript compilation. (7) (a: tests, cla: yes, ☸ platform-web)

33361 (trivial) Rename test file (a: tests, cla: yes, f: material design, framework)

33363 Add clarification in Animation’s listener API docs (cla: yes)

33369 Add loading support to Image (cla: yes, framework)

33370 Update FadeInImage to use new Image APIs (cla: yes, framework, severe: API break)