Revert "Revert "Add integer texture support.""

This reverts commit 9c7edb8311409a141b0dc1d5e480c68c629f1997.

Fixes ASAN errors

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4736

Change-Id: I1b1dae754d357b01da7169c8e7c59d7d8d8a10f6
Reviewed-on: https://skia-review.googlesource.com/4736
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/gn/tests.gni b/gn/tests.gni
index fb43d79..d828297 100644
--- a/gn/tests.gni
+++ b/gn/tests.gni
@@ -110,6 +110,7 @@
   "$_tests/IndexedPngOverflowTest.cpp",
   "$_tests/InfRectTest.cpp",
   "$_tests/InterpolatorTest.cpp",
+  "$_tests/IntTextureTest.cpp",
   "$_tests/InvalidIndexedPngTest.cpp",
   "$_tests/IsClosedSingleContourTest.cpp",
   "$_tests/LayerDrawLooperTest.cpp",