Allow chromedriver to set local state preferences.

chrome/test/automation/automation_json_requests.cc

Index: chrome/test/automation/automation_json_requests.cc
diff --git a/chrome/test/automation/automation_json_requests.cc b/chrome/test/automation/automation_json_requests.cc
index fc5d8f0c2f769b56d30d0472205f7a750f7eeb20..3058bace67f8df5ff88788cc44470598f77760b7 100644
--- a/chrome/test/automation/automation_json_requests.cc
+++ b/chrome/test/automation/automation_json_requests.cc
@@ -650,3 +650,30 @@ bool SendInstallExtensionJSONRequest(
   }
   return true;
 }
+
+bool SendSetLocalStatePreferenceJSONRequest(
+    AutomationMessageSender* sender,
+    const std::string& pref,
+    base::Value* value,
+    std::string* error_msg) {
+  DictionaryValue dict;
+  dict.SetString("command", "SetLocalStatePrefs");
+  dict.SetString("path", pref);
+  dict.Set("value", value);
+  DictionaryValue reply_dict;
+  return SendAutomationJSONRequest(sender, dict, &reply_dict, error_msg);
+}
+
+bool SendSetPreferenceJSONRequest(
+    AutomationMessageSender* sender,
+    const std::string& pref,
+    base::Value* value,
+    std::string* error_msg) {
+  DictionaryValue dict;
+  dict.SetString("command", "SetPrefs");
+  dict.SetInteger("windex", 0);
+  dict.SetString("path", pref);
+  dict.Set("value", value);
+  DictionaryValue reply_dict;
+  return SendAutomationJSONRequest(sender, dict, &reply_dict, error_msg);
+}