Print path to a file that contains badly formatted JSON.
Print path to a file that contains badly formatted JSON.

It helps to debug issues like in crrev.com/268298 a tiny bit faster.

R=iannucci@chromium.org
BUG=

Review URL: https://codereview.chromium.org/266823006

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@268342 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build