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.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=169750

[Mikhail, 2014-03-21 16:29:26]

PTAL

[eseidel, 2014-03-21 16:41:14]

lgtm

[commit-bot: I haz the power, 2014-03-21 16:41:16]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mikhail.pozdnyakov@intel.com/205583005/1

[commit-bot: I haz the power, 2014-03-21 16:48:29]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-03-21 16:48:30]

Try jobs failed on following builders:
  tryserver.blink on win_blink_compile_dbg

[abarth-chromium, 2014-03-21 17:12:22]

https://codereview.chromium.org/205583005/diff/1/Source/wtf/SizeLimits.cpp
File Source/wtf/SizeLimits.cpp (right):

https://codereview.chromium.org/205583005/diff/1/Source/wtf/SizeLimits.cpp#ne...
Source/wtf/SizeLimits.cpp:84: COMPILE_ASSERT(sizeof(AtomicString) ==
sizeof(String), AtomicString_should_stay_small);
We already have this compile assert somewhere else, but having it here too is
fine.

[abarth-chromium, 2014-03-21 17:12:26]

The CQ bit was checked by abarth@chromium.org

[commit-bot: I haz the power, 2014-03-21 17:12:32]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mikhail.pozdnyakov@intel.com/205583005/1

[commit-bot: I haz the power, 2014-03-21 17:48:33]

Change committed as 169750