Rebaselines.

TBR=borenet

Review URL: https://codereview.chromium.org/799063004
Even more win64 warning fixes

Review URL: https://codereview.chromium.org/800993002
Add image decoding mode to DM.

This is meant to supplant skimage.

BUG=skia:3235

Review URL: https://codereview.chromium.org/802793002
DM warning-free on win64

Review URL: https://codereview.chromium.org/805543002