13860 [web] Change canvas sibling transforms to 3d with z=0 to get around canvas rendering bug. (cla: yes)

13864 [flow][fuchsia] Add more tracing to layers and Fuchsia surface pool (cla: yes)

13865 [fuchsia] Package flutter_frontend_server snapshot for fuchsia (cla: yes)

13869 Changing test runner and platform to be browser independent (cla: yes)

13881 Change edge conditions of getLineBoundary (cla: yes)

13885 Work around Fuchsia a11y / ICU name conflict (cla: yes)

13901 [web] Fix single line bitmap canvas text shadow (cla: yes)

13902 Adding opacity -> alpha method to Color class (affects: framework, cla: yes)