Indexed PNG decoding: Ensure color table is large enough that the bit depth of the image will not allow reads beyond its end.

BUG=skia:3440
R=rmistry@google.com, scroggo@google.com

Committed: https://skia.googlesource.com/skia/+/493c1ce1cd406ef28683203146274154783452ce

Review URL: https://codereview.chromium.org/948163002
diff --git a/gyp/tests.gypi b/gyp/tests.gypi
index d4ca3af..f03488d 100644
--- a/gyp/tests.gypi
+++ b/gyp/tests.gypi
@@ -126,6 +126,7 @@
     '../tests/ImageGeneratorTest.cpp',
     '../tests/ImageIsOpaqueTest.cpp',
     '../tests/ImageNewShaderTest.cpp',
+    '../tests/IndexedPngOverflowTest.cpp',
     '../tests/InfRectTest.cpp',
     '../tests/InterpolatorTest.cpp',
     '../tests/InvalidIndexedPngTest.cpp',