Add 2 fuzz targets for image decoding (oss-fuzz)

This also adds in a few small guards to prevent libfuzzer from frequently
running out of memory when an image claims to have billions of pixels.

Bug: skia:
Change-Id: I47a9daac832c4d85a42000698482b61721c38880
Reviewed-on: https://skia-review.googlesource.com/106264
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index d45f692..364cde7 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1730,6 +1730,8 @@
       "fuzz/FuzzPathop.cpp",
       "fuzz/FuzzScaleToSides.cpp",
       "fuzz/fuzz.cpp",
+      "fuzz/oss_fuzz/FuzzAnimatedImage.cpp",
+      "fuzz/oss_fuzz/FuzzImage.cpp",
       "fuzz/oss_fuzz/FuzzImageFilterDeserialize.cpp",
       "fuzz/oss_fuzz/FuzzPathDeserialize.cpp",
       "fuzz/oss_fuzz/FuzzRegionDeserialize.cpp",