Add StaleWhileRevalidateExperiment histograms.

net/BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build_overrides/v8.gni")
@@ skipping 1260 matching lines @@
     "tools/quic/synchronous_host_resolver.h",
   ]
   deps = [
     ":net",
     "//base",
     "//base/third_party/dynamic_annotations",
     "//url",
   ]
 }
 
+action_foreach("stale_while_revalidate_experiment_domains_dafsa") {
+  script = "//net/tools/dafsa/make_dafsa.py"
+  sources = [
+    "base/stale_while_revalidate_experiment_domains.gperf",
+  ]
+  outputs = [
+    "${target_gen_dir}/base/{{source_name_part}}-inc.cc",
+  ]
+  args = [
+    "{{source}}",
+    rebase_path("${target_gen_dir}/base/{{source_name_part}}-inc.cc",
+                root_build_dir),
+  ]
+}
+
+source_set("stale_while_revalidate_experiment_domains") {
+  sources = [
+    "base/stale_while_revalidate_experiment_domains.cc",
+    "base/stale_while_revalidate_experiment_domains.h",
+  ]
+  deps = [
+    ":net",
+    ":stale_while_revalidate_experiment_domains_dafsa",
+    "//base",
+  ]
+  configs += net_shared_configs
+}
+
 if (!is_ios) {
   executable("quic_client") {
     sources = [
       "tools/quic/quic_simple_client_bin.cc",
     ]
     deps = [
       ":net",
       ":simple_quic_tools",
       "//base",
       "//build/config/sanitizers:deps",
@@ skipping 42 matching lines @@
     "//build/config/compiler:no_size_t_to_int_warning",
   ]
   defines = []
 
   deps = [
     ":balsa",
     ":extras",
     ":http_server",
     ":net",
     ":simple_quic_tools",
+    ":stale_while_revalidate_experiment_domains",
     ":test_support",
     "//base",
     "//base:i18n",
     "//base:prefs_test_support",
     "//base/allocator",
     "//base/third_party/dynamic_annotations",
     "//crypto",
     "//crypto:platform",
     "//crypto:test_support",
     "//net/base/registry_controlled_domains",
@@ skipping 324 matching lines @@
   if (enable_websockets) {
     sources += [ "websockets/websocket_frame_perftest.cc" ]
   }
 
   if (use_v8_in_net) {
     deps += [ ":net_with_v8" ]
   } else {
     sources -= [ "proxy/proxy_resolver_perftest.cc" ]
   }
 }