DevTools: Log non-well-formed JSON file name when compiling frontend
DevTools: Log non-well-formed JSON file name when compiling frontend

R=pfeldman
NOTRY=true

Review URL: https://codereview.chromium.org/718393006

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@185450 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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