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>
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
+#include "base/prefs/pref_change_registrar.h"
 #include "base/strings/string16.h"
 #include "base/threading/thread_checker.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "extensions/browser/extension_error.h"
 
 namespace content {
 class NotificationDetails;
 class NotificationSource;
 class RenderViewHost;
 }
 
+class ExtensionService;
 class Profile;
 
 namespace extensions {
 class ErrorConsoleUnitTest;
+class Extension;
 
 // The ErrorConsole is a central object to which all extension errors are
 // reported. This includes errors detected in extensions core, as well as
 // runtime Javascript errors.
 // This class is owned by ExtensionSystem, making it, in effect, a
 // BrowserContext-keyed service.
 class ErrorConsole : public content::NotificationObserver {
  public:
   typedef std::deque<const ExtensionError*> ErrorList;
   typedef std::map<std::string, ErrorList> ErrorMap;
 
   class Observer {
    public:
     // Sent when a new error is reported to the error console.
     virtual void OnErrorAdded(const ExtensionError* error) = 0;
 
     // Sent upon destruction to allow any observers to invalidate any references
     // they have to the error console.
     virtual void OnErrorConsoleDestroyed();
   };
 
-  explicit ErrorConsole(Profile* profile);
+  explicit ErrorConsole(Profile* profile, ExtensionService* extension_service);
   virtual ~ErrorConsole();
 
   // Convenience method to return the ErrorConsole for a given profile.
   static ErrorConsole* Get(Profile* profile);
 
   // Report an extension error, and add it to the list.
   void ReportError(scoped_ptr<const ExtensionError> error);
 
   // 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);
 
   const ErrorMap& errors() { 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.
+  void Disable();
+
+  // Called when the Developer Mode preference is changed; this is important
+  // since we use this as a heuristic to determine if the console is enabled or
+  // not.
+  void OnPrefChanged();
+
+  // Add manifest errors from an extension's install warnings.
+  void AddManifestErrorsForExtension(const Extension* extension);
+
   // Remove all errors which happened while incognito; we have to do this once
   // the incognito profile is destroyed.
   void RemoveIncognitoErrors();
 
   // Remove all errors relating to a particular |extension_id|.
   void RemoveErrorsForExtension(const std::string& extension_id);
 
   // Remove all errors for all extensions.
   void RemoveAllErrors();
 
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
+  // Whether or not the error console is enabled. Currently, this is set by
+  // whether or not the user has Developer Mode enabled.
+  bool enabled_;
+
   // Needed because ObserverList is not thread-safe.
   base::ThreadChecker thread_checker_;
 
   // The list of all observers for the ErrorConsole.
   ObserverList<Observer> observers_;
 
   // The errors which we have received so far.
   ErrorMap errors_;
 
   // The profile with which the ErrorConsole is associated. Only collect errors
   // from extensions and RenderViews associated with this Profile (and it's
   // incognito fellow).
   Profile* profile_;
 
-  content::NotificationRegistrar registrar_;
+  content::NotificationRegistrar notification_registrar_;
+  PrefChangeRegistrar pref_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ErrorConsole);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_ERROR_CONSOLE_ERROR_CONSOLE_H_