Reland #5: Ensure WebView notifies desktop automation on creation,
Previous attempts:
https://codereview.chromium.org/
880063002
https://codereview.chromium.org/
895623003/
https://codereview.chromium.org/
890013006/
https://codereview.chromium.org/
907973004/
https://codereview.chromium.org/
940763002/
Marks all flakey tests as MANUAL. The tests appear to be taking longer than the timeout on buildbots.
BUG=460150
TBR=dmazzoni@chromium.org
Review URL: https://codereview.chromium.org/
943693002
Cr-Commit-Position: refs/heads/master@{#317127}