Split of rolling Chromium from push-to-trunk.

This moves rolling Chromium into a new script with its own tests.

BUG=
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/199733012

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20159 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Add a utility method to the ia32 macro assembler to move a double immediate into an XMM register.

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/197233011

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20160 ce2b1a6d-e550-0410-aec6-3dcde31c8c00