Introduce lock screen app context to extension features

extensions/renderer/dispatcher.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/renderer/dispatcher.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
@@ skipping 399 matching lines @@
       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_BlessedWebPage",
                           elapsed);
       break;
     case Feature::WEBUI_CONTEXT:
       UMA_HISTOGRAM_TIMES("Extensions.DidCreateScriptContext_WebUI", elapsed);
       break;
     case Feature::SERVICE_WORKER_CONTEXT:
       // Handled in DidInitializeServiceWorkerContextOnWorkerThread().
       NOTREACHED();
       break;
+    case Feature::LOCK_SCREEN_EXTENSION_CONTEXT:
+      UMA_HISTOGRAM_TIMES(
+          "Extensions.DidCreateScriptContext_LockScreenExtension", elapsed);
+      break;
   }
 
   VLOG(1) << "Num tracked contexts: " << script_context_set_->size();
 }
 
 void Dispatcher::DidInitializeServiceWorkerContextOnWorkerThread(
     v8::Local<v8::Context> v8_context,
     int64_t service_worker_version_id,
     const GURL& url) {
   const base::TimeTicks start_time = base::TimeTicks::Now();
@@ skipping 1043 matching lines @@
   // The "guestViewDeny" module must always be loaded last. It registers
   // error-providing custom elements for the GuestView types that are not
   // available, and thus all of those types must have been checked and loaded
   // (or not loaded) beforehand.
   if (context_type == Feature::BLESSED_EXTENSION_CONTEXT) {
     module_system->Require("guestViewDeny");
   }
 }
 
 }  // namespace extensions