Introduce lock screen app context to extension features

extensions/renderer/script_context_set.cc

Index: extensions/renderer/script_context_set.cc
diff --git a/extensions/renderer/script_context_set.cc b/extensions/renderer/script_context_set.cc
index 8f520e40bf308850d65cb5b2edb6ae386fad22ca..9b65e05335149666ed629206b834233f4edfa24e 100644
--- a/extensions/renderer/script_context_set.cc
+++ b/extensions/renderer/script_context_set.cc
@@ -199,10 +199,13 @@ Feature::Context ScriptContextSet::ClassifyJavaScriptContext(
     // case this would usually be considered a (blessed) web page context,
     // unless the extension in question is a component extension, in which case
     // we cheat and call it blessed.
-    return (extension->is_hosted_app() &&
-            extension->location() != Manifest::COMPONENT)
-               ? Feature::BLESSED_WEB_PAGE_CONTEXT
-               : Feature::BLESSED_EXTENSION_CONTEXT;
+    if (extension->is_hosted_app() &&
+        extension->location() != Manifest::COMPONENT) {
+      return Feature::BLESSED_WEB_PAGE_CONTEXT;
+    }
+
+    return lock_screen_context_ ? Feature::LOCK_SCREEN_EXTENSION_CONTEXT
+                                : Feature::BLESSED_EXTENSION_CONTEXT;
   }
 
   // TODO(kalman): This isUnique() check is wrong, it should be performed as