Add HostCachePersistenceManager for Cronet

components/cronet/android/BUILD.gn

Index: components/cronet/android/BUILD.gn
diff --git a/components/cronet/android/BUILD.gn b/components/cronet/android/BUILD.gn
index 811f6306288a6cde31ec0ac746bd3ab457af5f5c..5e727a30ec2334c8460eadc04a43c913ec025f1e 100644
--- a/components/cronet/android/BUILD.gn
+++ b/components/cronet/android/BUILD.gn
@@ -195,6 +195,8 @@ template("cronet_static_tmpl") {
       "//components/cronet/android/url_request_error.h",
       "//components/cronet/histogram_manager.cc",
       "//components/cronet/histogram_manager.h",
+      "//components/cronet/host_cache_persistence_manager.cc",
+      "//components/cronet/host_cache_persistence_manager.h",
       "//components/cronet/stale_host_resolver.cc",
       "//components/cronet/stale_host_resolver.h",
       "//components/cronet/url_request_context_config.cc",
@@ -900,6 +902,7 @@ test("cronet_unittests") {
   sources = [
     "//components/cronet/android/cert/cert_verifier_cache_serializer_unittest.cc",
     "//components/cronet/histogram_manager_unittest.cc",
+    "//components/cronet/host_cache_persistence_manager_unittest.cc",
     "//components/cronet/run_all_unittests.cc",
     "//components/cronet/stale_host_resolver_unittest.cc",
     "//components/cronet/url_request_context_config_unittest.cc",
@@ -911,6 +914,7 @@ test("cronet_unittests") {
     "//base",
     "//base/test:test_support",
     "//components/metrics",
+    "//components/prefs:test_support",
     "//net",
     "//net:test_support",
     "//net/android:net_java",