Add a fuzzer for GzipSourceStream

net/BUILD.gn

Index: net/BUILD.gn
diff --git a/net/BUILD.gn b/net/BUILD.gn
index 0ddcebe50a2f3a23010333817129e682158b3616..0ae92a315ead6b4db20dc9036f22f59ff7761925 100644
--- a/net/BUILD.gn
+++ b/net/BUILD.gn
@@ -1658,6 +1658,8 @@ source_set("net_fuzzer_test_support") {
 
   sources = [
     "base/fuzzer_test_support.cc",
+    "filter/fuzzed_source_stream.cc",
+    "filter/fuzzed_source_stream.h",
     "socket/fuzzed_socket.cc",
     "socket/fuzzed_socket.h",
     "socket/fuzzed_socket_factory.cc",
@@ -1878,6 +1880,18 @@ fuzzer_test("net_http_stream_parser_fuzzer") {
   dict = "data/fuzzer_dictionaries/net_http_stream_parser_fuzzer.dict"
 }
 
+fuzzer_test("net_gzip_source_stream_fuzzer") {
+  sources = [
+    "filter/gzip_source_stream_fuzzer.cc",
+  ]
+  deps = [
+    ":net_fuzzer_test_support",
+    ":test_support",
+    "//base",
+    "//net",
+  ]
+}
+
 fuzzer_test("net_ftp_ctrl_response_fuzzer") {
   sources = [
     "ftp/ftp_ctrl_response_fuzzer.cc",