Introduce String and AtomicString size check
Introduce String and AtomicString size check

SSIA. Considering the memory sensitiveness of strings in Blink
we should make sure that no change can accidentally increase
their size.

Review URL: https://codereview.chromium.org/205583005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@169750 bbb929c8-8fbe-4397-9dbb-9b2b20218538

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk