27268 Revert “Roll webp to 1.2.0 and buildroot” (cla: yes)

27269 Roll Skia from b1fd64e82efd to c2f5b311ceac (3 revisions) (cla: yes, waiting for tree to go green)

27270 Roll Dart SDK from eb6ae1c165fc to ae01d698532b (2 revisions) (cla: yes, waiting for tree to go green)

27271 Roll Skia from c2f5b311ceac to 39122d445939 (1 revision) (cla: yes, waiting for tree to go green)

27272 Reland webp 1.2.0 (cla: yes)