24376 Defer making skshader until we know quality (cla: yes, waiting for tree to go green)

24377 Fixes hot restart correctly reset the browser history (cla: yes, waiting for tree to go green)

24378 Roll Skia from 28698696f1b3 to 3354f8c4f8cb (2 revisions) (cla: yes, waiting for tree to go green)

24379 [flutter_releases] Flutter Engine 1.26.0-17.6.pre Beta Cherrypicks (cla: yes)

24380 Roll Skia from 3354f8c4f8cb to 2494942f0d8d (4 revisions) (cla: yes, waiting for tree to go green)