Roll Flutter master to 3b87537b#9392

stuartmorgan-g wants to merge 2 commits intoflutter:mainflutter/packages:mainfrom

stuartmorgan-g:manual-roll-3b87537bbef6a0cdf8c2248f082b50a23ce0a3acstuartmorgan-g/packages:manual-roll-3b87537bbef6a0cdf8c2248f082b50a23ce0a3acCopy head branch name to clipboard