Deleted SkImage::newShaderClamp: not used, not implemented.

Implemented SkImage::newShader.

BUG=skia:2701, 344804
R=junov@chromium.org, reed@chromium.org, bsalomon@chromium.org, reed@google.com

Author: piotaixr@chromium.org

Review URL: https://codereview.chromium.org/345463009
7 files changed