Version 3.26.28 (based on bleeding_edge revision r21063)

PromiseThen should ignore non-function parameters (Chromium issue 347455).

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@21064 ce2b1a6d-e550-0410-aec6-3dcde31c8c00