fiddle: Add image handler.
fiddle: Add image handler.

BUG=skia:

Review URL: https://codereview.chromium.org/1893593002

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot