Add AffiliationFetcher to fetch authoritative affiliation information regarding facets.

components/password_manager/core/browser/BUILD.gn

Index: components/password_manager/core/browser/BUILD.gn
diff --git a/components/password_manager/core/browser/BUILD.gn b/components/password_manager/core/browser/BUILD.gn
index 907c7ef8691982788968f369ba28ff2b6b306da1..cd414b402642b4642bf4a33dbf435b4122b24f22 100644
--- a/components/password_manager/core/browser/BUILD.gn
+++ b/components/password_manager/core/browser/BUILD.gn
@@ -15,6 +15,9 @@ config("password_manager_config") {
 
 static_library("browser") {
   sources = [
+    "affiliation_fetcher_delegate.h",
+    "affiliation_fetcher.cc",
+    "affiliation_fetcher.h",
     "affiliation_utils.cc",
     "affiliation_utils.h",
     "browser_save_password_progress_logger.cc",
@@ -63,6 +66,7 @@ static_library("browser") {
   ]
 
   deps = [
+    ":proto",
     "//base",
     "//components/autofill/core/common",
     "//components/keyed_service/core",
@@ -70,6 +74,7 @@ static_library("browser") {
     "//components/password_manager/core/common",
     "//net",
     "//sql",
+    '//third_party/protobuf:protobuf_lite',
     "//url",
   ]
 
@@ -94,6 +99,12 @@ static_library("browser") {
   }
 }
 
+proto_library("proto") {
+  sources = [
+    "affiliation_api.proto"
+  ]
+}
+
 source_set("test_support") {
   testonly = true
   sources = [