DevTools: CPUProfiler: provide url for scripts that have sourceURL property.

BUG=none
TEST=SourceURLSupportForNewFunctions, LogExistingFunctionSourceURLCheck
R=jkummerow@chromium.org, yurys@chromium.org

Review URL: https://codereview.chromium.org/16035027

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15074 ce2b1a6d-e550-0410-aec6-3dcde31c8c00