linux: add a temporary flag for debugging plugin loading
linux: add a temporary flag for debugging plugin loading

We can use this to get more info from users about which plugins
we're loading and using.

Review URL: http://codereview.chromium.org/178040

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@24961 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