Perform install tasks for newly installed or upgraded component apps/extensions.

chrome/browser/extensions/component_loader.h

Index: chrome/browser/extensions/component_loader.h
diff --git a/chrome/browser/extensions/component_loader.h b/chrome/browser/extensions/component_loader.h
index 4904e1cb26477da5d9e4592f9ba82e1b78c3297b..77d5c1740b0a4c2a5f36cfd60a6a08d20743d558 100644
--- a/chrome/browser/extensions/component_loader.h
+++ b/chrome/browser/extensions/component_loader.h
@@ -65,6 +65,10 @@ class ComponentLoader {
   void Remove(const FilePath& root_directory);
   void Remove(const std::string& id);
 
+  // Call this during test setup to load component extensions that have
+  // background pages for testing, which could otherwise interfere with tests.
+  static void EnableBackgroundExtensionsForTesting();
+
   // Adds the default component extensions.
   void AddDefaultComponentExtensions();
 
@@ -109,6 +113,7 @@ class ComponentLoader {
   // Loads a registered component extension.
   const Extension* Load(const ComponentExtensionInfo& info);
 
+  void AddDefaultComponentExtensionsWithBackgroundPages();
   void AddFileManagerExtension();
 
 #if defined(OS_CHROMEOS)