Add initial components unit tests to GN build.

components/autofill/content/browser/BUILD.gn

Index: components/autofill/content/browser/BUILD.gn
diff --git a/components/autofill/content/browser/BUILD.gn b/components/autofill/content/browser/BUILD.gn
index bdae0f2f54064af0dc186ba832756463bb6c24f5..dce931db14dda898e63226a4826054f5ae1597db 100644
--- a/components/autofill/content/browser/BUILD.gn
+++ b/components/autofill/content/browser/BUILD.gn
@@ -64,6 +64,10 @@ static_library("browser") {
     #"../third_party/libjingle/libjingle.gyp:libjingle",  TODO(GYP)
     #"user_prefs",  TODO(GYP)
   ]
+
+  forward_dependent_configs_from = [
+    "//skia",
+  ]
 }
 
 proto_library("risk_proto") {
@@ -85,3 +89,24 @@ static_library("test_support") {
     "//testing/gmock",
   ]
 }
+
+source_set("unit_tests") {
+  sources = [
+    "content_autofill_driver_unittest.cc",
+    "request_autocomplete_manager_unittest.cc",
+    "wallet/full_wallet_unittest.cc",
+    "wallet/instrument_unittest.cc",
+    "wallet/wallet_address_unittest.cc",
+    "wallet/wallet_client_unittest.cc",
+    "wallet/wallet_items_unittest.cc",
+    "wallet/wallet_service_url_unittest.cc",
+    "wallet/wallet_signin_helper_unittest.cc",
+  ]
+
+  deps = [
+    ":browser",
+    ":test_support",
+    "//testing/gmock",
+    "//testing/gtest",
+  ]
+}