Declarative content scripts: Browser-side: per-extension shared memory regions (lazily loaded)

extensions/renderer/user_script_set_manager.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/user_script_set_manager.h"
 
 #include "content/public/renderer/render_thread.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/renderer/dispatcher.h"
 #include "extensions/renderer/user_script_set.h"
@@ skipping 89 matching lines @@
       scripts = new UserScriptSet(extensions_);
       programmatic_scripts_[extension_id] = make_linked_ptr(scripts);
     } else {
       scripts = programmatic_scripts_[extension_id].get();
     }
   } else {
     scripts = &static_scripts_;
   }
   DCHECK(scripts);
 
-  // If no extensions are included in the set, that indicates that all
-  // extensions were updated. Add them all to the set so that observers and
-  // individual UserScriptSets don't need to know this detail.
-  const std::set<std::string>* effective_extensions = &changed_extensions;
-  std::set<std::string> all_extensions;
-  if (changed_extensions.empty()) {
-    all_extensions = extensions_->GetIDs();
-    effective_extensions = &all_extensions;
-  }
-
-  if (scripts->UpdateUserScripts(shared_memory, *effective_extensions)) {
+  if (scripts->OnUpdateUserScripts(shared_memory, changed_extensions)) {
     FOR_EACH_OBSERVER(
         Observer,
         observers_,
-        OnUserScriptsUpdated(*effective_extensions, scripts->scripts()));
+        OnUserScriptsUpdated(changed_extensions, scripts->scripts()));
   }
 }
 
 }  // namespace extensions