Adds a backend for increased performance of chromium-build 

This CL: 
a) adds all the backend infrastructure to store rows of data in memory for easy access and fast rendering; 
b) contains a complete backend updater and data storage mechanism; 
c) stubs out the backend renderer (which will serve nearly-complete pages to the current frontend); and 
d) has no effect (yet) on the current frontend.

Review URL:

git-svn-id: svn:// 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed