Add sidebar views implementation using ExtensionSystem SidebarManager

chrome/common/pref_names.h

 // Copyright (c) 2012 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.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 
 #include <stddef.h>
@@ skipping 505 matching lines @@
 extern const char kShutdownNumProcessesSlow[];
 
 extern const char kRestartLastSessionOnShutdown[];
 extern const char kWasRestarted[];
 #if defined(OS_WIN)
 extern const char kRelaunchMode[];
 #endif
 
 extern const char kDisableExtensions[];
 extern const char kDisablePluginFinder[];
+extern const char kExtensionSidebarWidth[];
 
 extern const char kNtpAppPageNames[];
 #if defined(OS_ANDROID)
 extern const char kNtpCollapsedCurrentlyOpenTabs[];
 #endif
 extern const char kNtpCollapsedForeignSessions[];
 #if defined(OS_ANDROID)
 extern const char kNtpCollapsedRecentlyClosedTabs[];
 extern const char kNtpCollapsedSnapshotDocument[];
 extern const char kNtpCollapsedSyncPromo[];
@@ skipping 273 matching lines @@
 
 #if defined(ENABLE_EXTENSIONS)
 extern const char kAnimationPolicy[];
 #endif
 
 extern const char kBackgroundTracingLastUpload[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_