15966 Roll fuchsia/sdk/core/mac-amd64 from 6_pZp… to 7fqYj… (autoroller: commit, cla: yes)

15967 Roll src/third_party/skia 3ea4d5bb857d..45add166fdb9 (1 commits) (autoroller: commit, cla: yes)

15969 [web] Reduce canvas allocation when drawing image. (cla: yes)

15970 Optimize drawRRect to use dom_canvas (cla: yes)

15971 Roll fuchsia/sdk/core/linux-amd64 from 8Ns10… to 2rLoq… (cla: yes, waiting for tree to go green)

15972 Refactor ShellTest to allow for different ShellTestPlatformViews (cla: yes)