24942 Roll Dart SDK from 22d0f712b0a6 to 526b85706ed7 (1 revision) (cla: yes, waiting for tree to go green)

24943 Roll Fuchsia Linux SDK from XaUP9-wm3… to Q1DG3XKnA… (cla: yes, waiting for tree to go green)

24944 [Linux] Fix high CPU consumption (cla: yes)

24946 Roll Fuchsia Mac SDK from CxbV_a22u… to xpyKHzaGr… (cla: yes, waiting for tree to go green)

24947 Reland “Remove pipeline in favor of layer tree holder” (cla: yes)

24949 [web] Silence flaky history test (affects: tests, cla: yes, platform-web)