Revert "Stop freeing the command buffer when a tab goes to the background.  This essentially reverts functionality"
Revert "Stop freeing the command buffer when a tab goes to the background. 
This essentially reverts functionality"

This reverts commit 95bba3796b53af298d6ebbd133e148d6579c3bdc.

BUG=103989,108305,108176
TEST=none


Review URL: http://codereview.chromium.org/9211017

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@118140 0039d316-1c4b-4281-b951-d872f2087c98

adobe/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,ropik/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,ropik/chromium,ropik/chromium,adobe/chromium,ropik/chromium,adobe/chromium,adobe/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,ropik/chromium,gavinp/chromium