Allow cloud print service to initialize broker.

Bug: 1102447
Change-Id: I9f19ff9903a88fa0ff01fa1c7f42e2772e49baa8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2298039Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788365}

chrome/app/main_dll_loader_win.cc

@@ -133,12 +133,14 @@ int MainDllLoader::Launch(HINSTANCE instance,
   // Initialize the sandbox services.
   sandbox::SandboxInterfaceInfo sandbox_info = {0};
   const bool is_browser = process_type_.empty();
+  const bool is_cloud_print_service =
+      process_type_ == switches::kCloudPrintServiceProcess;
   // IsUnsandboxedSandboxType() can't be used here because its result can be
   // gated behind a feature flag, which are not yet initialized.
   const bool is_sandboxed =
       sandbox::policy::SandboxTypeFromCommandLine(cmd_line) !=
       sandbox::policy::SandboxType::kNoSandbox;
-  if (is_browser || is_sandboxed) {
+  if (is_browser || is_cloud_print_service || is_sandboxed) {
     // For child processes that are running as --no-sandbox, don't initialize
     // the sandbox info, otherwise they'll be treated as brokers (as if they
     // were the browser).