Add SCOPED_TRACEs to ICUStringConversionsTest to help debug http://bugs.gentoo.org/show_bug.cgi?id=350347
Add SCOPED_TRACEs to ICUStringConversionsTest
to help debug http://bugs.gentoo.org/show_bug.cgi?id=350347

They are also useful in general, so I don't plan to remove them later.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/5982003

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@70430 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