Check for null RenderWidgetHost Also report restore times to UMA
Check for null RenderWidgetHost
Also report restore times to UMA

BUG=71566
TEST=None

Review URL: http://codereview.chromium.org/6621036

git-svn-id: http://src.chromium.org/svn/trunk/src@77159 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: eeb137a55ca0ff742536455605a05d881ea580a6
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser