Add hooks to allow lock screen app pages in sign-in profile

chrome/browser/extensions/chrome_process_manager_delegate.cc

Index: chrome/browser/extensions/chrome_process_manager_delegate.cc
diff --git a/chrome/browser/extensions/chrome_process_manager_delegate.cc b/chrome/browser/extensions/chrome_process_manager_delegate.cc
index 9e983ef02c50b43e1403cf82acec08e78694bffc..b5590eae7b4f0421c80cd14099bbce5c8be1f4b6 100644
--- a/chrome/browser/extensions/chrome_process_manager_delegate.cc
+++ b/chrome/browser/extensions/chrome_process_manager_delegate.cc
@@ -22,9 +22,12 @@
 #include "extensions/browser/process_manager_factory.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/one_shot_event.h"
+#include "extensions/common/permissions/api_permission.h"
+#include "extensions/common/permissions/permissions_data.h"
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
+#include "chromeos/chromeos_switches.h"
 #endif
 
 namespace extensions {
@@ -69,6 +72,13 @@ bool ChromeProcessManagerDelegate::IsExtensionBackgroundPageAllowed(
       !profile->IsOffTheRecord();
 
   if (is_signin_profile) {
+    if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+            chromeos::switches::kEnableLockScreenApps) &&
+        extension.permissions_data()->HasAPIPermission(
+            APIPermission::kLockScreen)) {
+      return true;
+    }
+
     // Check for flag.
     if (base::CommandLine::ForCurrentProcess()->HasSwitch(
             switches::kDisableLoginScreenApps)) {