Enable side-by-side beta and dev channels.

chrome/common/chrome_icon_resources_win.h

 // Copyright 2014 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_COMMON_CHROME_ICON_RESOURCES_WIN_H_
 #define CHROME_COMMON_CHROME_ICON_RESOURCES_WIN_H_
 
 namespace icon_resources {
 
 // This file contains the indices of icon resources in chrome_exe.rc.
@@ skipping 12 matching lines @@
   kSxSApplicationIndex = 4,
 
   // The Chrome App Launcher icon.
   kAppLauncherIndex = 5,
 
   // The Chrome App Launcher Canary icon.
   kSxSAppLauncherIndex = 6,
 
   // The Chrome incognito icon.
   kIncognitoIndex = 7,
+
+  // The Chrome Dev application icon.
+  kDevApplicationIndex = 8,
+
+  // The Chrome Beta application icon.
+  kBetaApplicationIndex = 9,

[robertshield, 2017/04/05 21:29:37]

part of me want to re-use the legacy indices which iirc were actually never
used. This is fine too though.

[grt (UTC plus 2), 2017/04/20 13:53:04]

huh. i can't find any record of them being used, either (they were added for
https://crbug.com/12701). i seem to recall there being a teeny tiny trickle of
complaints when the placeholders landed, so i think it's safest to not reuse
them.

 #else   // defined(GOOGLE_CHROME_BUILD)
   // The Chromium App Launcher icon.
   kAppLauncherIndex = 1,
 
   // The Chromium incognito icon.
   kIncognitoIndex = 2,
 #endif  // defined(GOOGLE_CHROME_BUILD)
 };
 
 }  // namespace icon_resources
 
 #endif  // CHROME_COMMON_CHROME_ICON_RESOURCES_WIN_H_