Add more as seed corpus for blink_png_decoder_fuzzer.

Add corpus //WebKit/LayoutTests/images/png-suite/samples and
//cc/test/data

R=noel@chromium.org, scroggo@chromium.org
BUG=437662,678181

Review-Url: https://codereview.chromium.org/2686843002
Cr-Commit-Position: refs/heads/master@{#449287}
1 file changed