add sksl fuzzers (#2228)

projects/skia/BUILD.gn.diff

@@ -376,3 +376,38 @@ test_app("image_decode_incremental") {
   ]
 }
 
+test_app("sksl2glsl") {
+  sources = [
+    "fuzz/Fuzz.cpp",
+    "fuzz/FuzzCommon.cpp",
+    "fuzz/oss_fuzz/FuzzSKSL2GLSL.cpp",
+  ]
+  deps = [
+    ":gpu_tool_utils",
+    ":skia",
+  ]
+}
+
+test_app("sksl2spirv") {
+  sources = [
+    "fuzz/Fuzz.cpp",
+    "fuzz/FuzzCommon.cpp",
+    "fuzz/oss_fuzz/FuzzSKSL2SPIRV.cpp",
+  ]
+  deps = [
+    ":gpu_tool_utils",
+    ":skia",
+  ]
+}
+
+test_app("sksl2metal") {
+  sources = [
+    "fuzz/Fuzz.cpp",
+    "fuzz/FuzzCommon.cpp",
+    "fuzz/oss_fuzz/FuzzSKSL2Metal.cpp",
+  ]
+  deps = [
+    ":gpu_tool_utils",
+    ":skia",
+  ]
+}

projects/skia/Dockerfile

@@ -70,6 +70,8 @@ RUN wget -O $SRC/skia/skjson_seed_corpus.zip https://storage.googleapis.com/skia
 
 RUN wget -O $SRC/skia/api_polyutils_seed_corpus.zip https://storage.googleapis.com/skia-fuzzer/oss-fuzz/api_polyutils_seed_corpus.zip
 
+RUN wget -O $SRC/skia/sksl_seed_corpus.zip https://storage.googleapis.com/skia-fuzzer/oss-fuzz/sksl_seed_corpus.zip
+
 COPY build.sh $SRC/
 
 COPY skia.diff $SRC/skia/skia.diff
@@ -100,6 +102,11 @@ COPY api_fuzzers.options $SRC/skia/api_pathop.options
 COPY api_fuzzers.options $SRC/skia/api_polyutils.options
 COPY api_fuzzers.options $SRC/skia/api_raster_n32_canvas.options
 
+# SKSL fuzzers can share options
+COPY sksl.options $SRC/skia/sksl2glsl.options
+COPY sksl.options $SRC/skia/sksl2spirv.options
+COPY sksl.options $SRC/skia/sksl2metal.options
+
 COPY json.dict $SRC/skia/json.dict
 
 COPY BUILD.gn.diff $SRC/skia/BUILD.gn.diff

projects/skia/build.sh

@@ -99,7 +99,8 @@ $SRC/depot_tools/ninja -C out/Fuzz region_deserialize region_set_path \
                                    jpeg_encoder webp_encoder skottie_json \
                                    textblob_deserialize skjson \
                                    api_null_canvas api_image_filter api_pathop \
-                                   api_polyutils android_codec image_decode_incremental
+                                   api_polyutils android_codec image_decode_incremental \
+                                   sksl2glsl sksl2spirv sksl2metal
 
 $SRC/depot_tools/ninja -C out/Fuzz_mem_constraints image_filter_deserialize \
                                                    api_raster_n32_canvas \
@@ -206,3 +207,15 @@ cp ./image_decode_seed_corpus.zip $OUT/android_codec_seed_corpus.zip.
 cp out/Fuzz/image_decode_incremental $OUT/image_decode_incremental
 cp ./image_decode_incremental.options $OUT/image_decode_incremental.options
 cp ./image_decode_seed_corpus.zip $OUT/image_decode_incremental_seed_corpus.zip
+
+cp out/Fuzz/sksl2glsl $OUT/sksl2glsl
+cp ./sksl2glsl.options $OUT/sksl2glsl.options
+cp ./sksl_seed_corpus.zip $OUT/sksl2glsl_seed_corpus.zip
+
+cp out/Fuzz/sksl2spirv $OUT/sksl2spirv
+cp ./sksl2spirv.options $OUT/sksl2spirv.options
+cp ./sksl_seed_corpus.zip $OUT/sksl2spirv_seed_corpus.zip
+
+cp out/Fuzz/sksl2metal $OUT/sksl2metal
+cp ./sksl2metal.options $OUT/sksl2metal.options
+cp ./sksl_seed_corpus.zip $OUT/sksl2metal_seed_corpus.zip

projects/skia/sksl.options

@@ -0,0 +1,2 @@
+[libfuzzer]
+max_len = 3000