29290 [fuchsia] Add missing protocols to V2 runner. (cla: yes, waiting for tree to go green, platform-fuchsia)

29291 Delay default font manager to run concurrently with isolate setup (cla: yes, waiting for tree to go green)

29292 Roll Dart SDK from 84c74548e30a to 64f7ed6aa45a (11 revisions) (cla: yes, waiting for tree to go green)

29297 Roll Dart SDK from 64f7ed6aa45a to 70c57ad7db0b (2 revisions) (cla: yes, waiting for tree to go green)

29298 add flow events to the timeline to track the lifecycle of cache images (cla: yes, waiting for tree to go green, needs tests)