[CSP] enforcement on non text-html resources

I came across a feature of Chrome in which an image/gif resource gets
wrapped in some browser-provided html. This, in combination with CSP
being applied to the image response, created a large number of CSP
violations. This does not repro on Firefox.

Does the spec say anything about CSPs relationship with non-text/html
resources? I did not expect the html to be added, but I also did not
expect CSP to be applied.

I've already put up a patch to stop applying CSP to this resource. Was
that the right thing to do?

Mike and I are chatting on the chromium bug tracker[1]. What say you?

[1] https://code.google.com/p/chromium/issues/detail?can=2&start=0&num=100&q=&colspec=ID%20Pri%20M%20Iteration%20ReleaseBlock%20Cr%20Status%20Owner%20Summary%20OS%20Modified&groupby=&sort=&id=380398