Add update available icon in system tray

chrome/common/url_constants.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.
 
 // Contains constants for known URLs and portions thereof.
 
 #ifndef CHROME_COMMON_URL_CONSTANTS_H_
 #define CHROME_COMMON_URL_CONSTANTS_H_
 
 #include <stddef.h>
@@ skipping 337 matching lines @@
 #if defined(OS_CHROMEOS)
 extern const char kAccessibilitySubPage[];
 extern const char kBluetoothSubPage[];
 extern const char kDateTimeSubPage[];
 extern const char kDisplaySubPage[];
 extern const char kDeprecatedOptionsSearchSubPage[];
 extern const char kInternetSubPage[];
 extern const char kNetworkDetailSubPage[];
 extern const char kPowerSubPage[];
 extern const char kStylusSubPage[];
+extern const char kHelpSubPage[];

[stevenjb, 2017/05/15 18:06:45]

I guess this is fine for now but FYI I just filed crbug.com/722450 to change
this to chrome://settings/about to better match the title and usage of the page.

[weidongg, 2017/05/15 20:06:57]

Ok, I see. Should I rename it to kAboutChromeOSPage?

[stevenjb, 2017/05/15 20:25:28]

We could, but I think that might be confusing, so maybe wait until we change the
url? Whichever seems less confusing to you.

[weidongg, 2017/05/16 19:46:08]

Ok, I see.

 #endif
 
 // Extensions sub pages.
 extern const char kExtensionConfigureCommandsSubPage[];
 
 // URL used to indicate that an extension resource load request was invalid.
 extern const char kExtensionInvalidRequestURL[];
 
 extern const char kSyncGoogleDashboardURL[];
 
@@ skipping 253 matching lines @@
 extern const char kChooserUsbOverviewURL[];
 
 #if defined(OS_CHROMEOS)
 // The URL for EOL notification
 extern const char kEolNotificationURL[];
 #endif
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_URL_CONSTANTS_H_