Add ErrorConsole UI for Extension Install Warnings

chrome/browser/extensions/error_console/error_console.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_ERROR_CONSOLE_ERROR_CONSOLE_H_
 #define CHROME_BROWSER_EXTENSIONS_ERROR_CONSOLE_ERROR_CONSOLE_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 51 matching lines @@
 
   // Get a collection of weak pointers to all errors relating to the extension
   // with the given |extension_id|.
   const ErrorList& GetErrorsForExtension(const std::string& extension_id) const;
 
   // Add or remove observers of the ErrorConsole to be notified of any errors
   // added.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
+  bool enabled() const { return enabled_; }
   const ErrorMap& errors() const { return errors_; }
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ErrorConsoleUnitTest, AddAndRemoveErrors);
 
   // Enable the error console for error collection and retention. This involves
   // subscribing to the appropriate notifications and fetching manifest errors.
   void Enable(ExtensionService* extension_service);
   // Disable the error console, removing the subscriptions to notifications and
   // removing all current errors.
@@ skipping 43 matching lines @@
 
   content::NotificationRegistrar notification_registrar_;
   PrefChangeRegistrar pref_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ErrorConsole);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_ERROR_CONSOLE_ERROR_CONSOLE_H_