[libfuzzer] Blacklist skia_path_fuzzer and skia_pathop_fuzzer for Debug build.

testing/libfuzzer/fuzzers/BUILD.gn

Index: testing/libfuzzer/fuzzers/BUILD.gn
diff --git a/testing/libfuzzer/fuzzers/BUILD.gn b/testing/libfuzzer/fuzzers/BUILD.gn
index 658f206d75a088fa06b2e613e58ef8943191fdc4..a028ec47265464c430350c09358a4a52bf3a7672 100644
--- a/testing/libfuzzer/fuzzers/BUILD.gn
+++ b/testing/libfuzzer/fuzzers/BUILD.gn
@@ -323,6 +323,10 @@ fuzzer_test("skia_path_fuzzer") {
     "//skia",
   ]
   libfuzzer_options = [ "max_len=256" ]
+  if (is_debug) {
+    # Disabled due to crashing on SkASSERT (crbug.com/642750, crbug.com/643275).
+    additional_configs = [ "//testing/libfuzzer:no_clusterfuzz" ]
+  }
 }
 
 fuzzer_test("skia_pathop_fuzzer") {
@@ -335,4 +339,8 @@ fuzzer_test("skia_pathop_fuzzer") {
     "//skia",
   ]
   libfuzzer_options = [ "max_len=512" ]
+  if (is_debug) {
+    # Disabled due to crashing on SkASSERT (crbug.com/642750, crbug.com/643275).
+    additional_configs = [ "//testing/libfuzzer:no_clusterfuzz" ]
+  }
 }