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
diff --git a/gyp/tests.gypi b/gyp/tests.gypi
index 66741d5..ec12461 100644
--- a/gyp/tests.gypi
+++ b/gyp/tests.gypi
@@ -102,6 +102,7 @@
     '../tests/ImageCacheTest.cpp',
     '../tests/ImageDecodingTest.cpp',
     '../tests/ImageFilterTest.cpp',
+    '../tests/ImageNewShaderTest.cpp',
     '../tests/InfRectTest.cpp',
     '../tests/InterpolatorTest.cpp',
     '../tests/JpegTest.cpp',