Give the TabContentsContainer a white background so the user will initially see white.  On debug builds, you see white, green, then the page.
Give the TabContentsContainer a white background so the user will
initially see white.  On debug builds, you see white, green, then
the page.

BUG=20059

Review URL: http://codereview.chromium.org/342027

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@30395 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser