[headless] Add option to disable sandbox from API

headless/public/headless_browser.cc

Index: headless/public/headless_browser.cc
diff --git a/headless/public/headless_browser.cc b/headless/public/headless_browser.cc
index b1e5dbcc026ec701c2dab1ba3e5f6be04e990d45..82e96c62d976e136fee55b572a17e57670a711ea 100644
--- a/headless/public/headless_browser.cc
+++ b/headless/public/headless_browser.cc
@@ -64,6 +64,11 @@ Builder& Builder::SetSingleProcessMode(bool single_process_mode) {
   return *this;
 }
 
+Builder& Builder::SetDisableSandbox(bool disable_sandbox) {
+  options_.disable_sandbox = disable_sandbox;
+  return *this;
+}
+
 Builder& Builder::SetProtocolHandlers(ProtocolHandlerMap protocol_handlers) {
   options_.protocol_handlers = std::move(protocol_handlers);
   return *this;