[Doodle] Cache the DoodleConfig in prefs

components/doodle/BUILD.gn

Index: components/doodle/BUILD.gn
diff --git a/components/doodle/BUILD.gn b/components/doodle/BUILD.gn
index 86c2537513854ec19987ca011fbdefb1152d8702..3b7914450ccbee0db044c37c193d9141bcaf68de 100644
--- a/components/doodle/BUILD.gn
+++ b/components/doodle/BUILD.gn
@@ -11,12 +11,15 @@ static_library("doodle") {
     "doodle_service.h",
     "doodle_types.cc",
     "doodle_types.h",
+    "pref_names.cc",
+    "pref_names.h",
   ]
 
   deps = [
     "//base",
     "//components/data_use_measurement/core",
     "//components/google/core/browser",
+    "//components/prefs",
     "//net",
   ]
 }
@@ -32,6 +35,7 @@ source_set("unit_tests") {
   deps = [
     ":doodle",
     "//components/google/core/browser",
+    "//components/prefs:test_support",
     "//net:test_support",
     "//ui/base",
   ]