Revert "Add window.performance.now() to the d8 shell."

This reverts commit r17366 for breaking the mozilla tests.

TBR=hpayer@chromium.org

Review URL: https://codereview.chromium.org/38753006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17367 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Add performance.now() to the d8 shell.

TEST=mjsunit/d8-performance-now
R=hpayer@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=17366

Review URL: https://codereview.chromium.org/32433010

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17368 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Add code age subtype tracking to --track-gc-object-stats

Adds counters which track the age of code in the heap during a gc if
--track-gc-object-stats is enabled.

 - Splits RecordObjectStats into RecordObjectStats, RecordCodeSubTypeStats and
   RecordFixedArraySubTypeStats.
 - Renames kNoAge to kNoAgeCodeAge to follow other code age enums and enable
   the name to be used in Macro based initialization of the counters.

BUG=None
R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/26179004

Patch from Ross McIlroy <rmcilroy@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17369 ce2b1a6d-e550-0410-aec6-3dcde31c8c00