Add GN For hpack fuzzing utilities and net_perftests.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 53fe10dfde4493e20b7ce76123d6ec2206858150..a38151fc55d6626a5c1339225ba7fa47d31890ea 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -62,6 +62,10 @@ group("gn_all") {
     "//media/cast:cast_unittests",
     "//mojo",
     "//mojo/common:mojo_common_unittests",
+    "//net:hpack_example_generator",
+    "//net:hpack_fuzz_mutator",
+    "//net:hpack_fuzz_wrapper",
+    "//net:net_perftests",
     "//net:net_unittests",
     "//ppapi:ppapi_unittests",
     "//ppapi/examples",  # TODO(GYP): What's the GYP equivalent?
@@ -182,6 +186,10 @@ group("gn_all") {
       "//google_apis/gcm:gcm_unit_tests",
       "//ipc:ipc_tests",  # TODO(GYP) ??
       "//jingle:jingle_unittests",  # TODO(GYP) ??
+      "//net:hpack_example_generator",
+      "//net:hpack_fuzz_mutator",
+      "//net:hpack_fuzz_wrapper",
+      "//net:net_perftests",
       "//net:net_unittests",
       "//ppapi/examples",
       "//third_party/pdfium/samples:pdfium_test",