Allow chromedriver to set local state preferences.

chrome/test/automation/automation_json_requests.h

Index: chrome/test/automation/automation_json_requests.h
diff --git a/chrome/test/automation/automation_json_requests.h b/chrome/test/automation/automation_json_requests.h
index 28d607d334d6a466747a8cb020b6b1f32b4359e9..85e9a7839e9ac829189497040911f00313df2d87 100644
--- a/chrome/test/automation/automation_json_requests.h
+++ b/chrome/test/automation/automation_json_requests.h
@@ -332,4 +332,20 @@ bool SendInstallExtensionJSONRequest(
     std::string* extension_id,
     std::string* error_msg) WARN_UNUSED_RESULT;
 
+// Requests the local state preference to be set to the given value.
+// Ownership of |value| is taken by this function. Returns true on success.
+bool SendSetLocalStatePreferenceJSONRequest(
+    AutomationMessageSender* sender,
+    const std::string& pref,
+    base::Value* value,
+    std::string* error_msg) WARN_UNUSED_RESULT;
+
+// Requests the user preference to be set to the given value.
+// Ownership of |value| is taken by this function. Returns true on success.
+bool SendSetPreferenceJSONRequest(
+    AutomationMessageSender* sender,
+    const std::string& pref,
+    base::Value* value,
+    std::string* error_msg) WARN_UNUSED_RESULT;
+
 #endif  // CHROME_TEST_AUTOMATION_AUTOMATION_JSON_REQUESTS_H_