Version 3.27.11 (based on bleeding_edge revision r21445)

Add support for ES6 Symbol in heap profiler (Chromium issue 376194).

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@21446 ce2b1a6d-e550-0410-aec6-3dcde31c8c00