[signin] Unit test for DiceResponseHandler

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index 71c00b49ce49c05c9b9164cf89358fddc1d1c185..a33ce7e024b78549b5be3383b5a9086c2bb688d8 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -11,6 +11,7 @@ import("//chrome/common/features.gni")
 import("//chrome/chrome_repack_locales.gni")
 import("//components/offline_pages/features/features.gni")
 import("//components/os_crypt/features.gni")
+import("//components/signin/features.gni")
 import("//components/spellcheck/spellcheck_build_features.gni")
 import("//extensions/features/features.gni")
 import("//media/media_options.gni")
@@ -3490,6 +3491,10 @@ test("unit_tests") {
     data_deps += [ "//chrome:chrome_framework" ]
   }
 
+  if (enable_dice_support) {
+    sources += [ "../browser/signin/dice_response_handler_unittest.cc" ]
+  }
+
   if (enable_offline_pages) {
     sources += [
       "../browser/android/offline_pages/offline_page_mhtml_archiver_unittest.cc",