Implement PersistentValueMap, a map that stores UniquePersistent values.
This is preparatory work to get rid of UnsafePersistent in blink.
The previous version had to be reverted due to timeouts in win32/Debug: https://codereview.chromium.org/
197173002/
The timeouts happened because the STL version on that platform contains sanity checking code which opens a 'debug window' in the GUI, patiently waiting for the user to click ok/cancel/somethirdoption. It turns out, the cause for that debug window was totally valid and the test had a use-after-free issue.
The 1st patch set is the code as before. The 2nd patch set contains the fix.
Related blink changes are here: https://codereview.chromium.org/
180363004/
This patch is largely based on https://codereview.chromium.org/
175503003/, with some methods added to support the blink change mentioned above.
BUG=
R=dcarney@chromium.org
Review URL: https://codereview.chromium.org/
197263002
Patch from Daniel Vogelheim <vogelheim@chromium.org>.
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19873
ce2b1a6d-e550-0410-aec6-
3dcde31c8c00