Mark svg/dom/viewspec-* tests as flaky.
Mark svg/dom/viewspec-* tests as flaky.

BUG=442512
TBR=pdr@chromium.org

Review URL: https://codereview.chromium.org/811563002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@187189 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs