Linux: Support the --class argument (Reland)

chrome/common/chrome_switches.cc

 // 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.
 
 #include "chrome/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "build/build_config.h"
 
@@ skipping 1120 matching lines @@
 
 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_CHROMEOS)
 // These flags show the man page on Linux. They are equivalent to each
 // other.
 const char kHelp[]                          = "help";
 const char kHelpShort[]                     = "h";
 
 // Specifies which password store to use (detect, default, gnome, kwallet).
 const char kPasswordStore[]                 = "password-store";
 
-// Updates X11Desktophandler::wm_user_time_ms with the latest X server time.
+// The same as the --class argument in X applications.  Overrides the WM_CLASS

[Lei Zhang, 2016/07/29 00:41:43]

Just -class, as seen in "man xterm"

[Tom (Use chromium acct), 2016/07/29 18:52:34]

-class in xterm is different.  xterm does not support --class

Try "gedit --class=Foo" and then "xprop WM_CLASS" and click on the gedit window
to test.

[Lei Zhang, 2016/07/29 19:03:39]

I thought more X apps supported -class, but it looks more like an xterm-ism.
OTOH, --class is probably a GTKism, since konqueror and other KDE apps don't
support it. It's fine to leave it as is. Users who need it will figure it out.

+// window property with the given value.
+const char kWmClass[]                       = "class";
+
+// Updates X11DesktopHandler::wm_user_time_ms with the latest X server time.
 const char kWmUserTimeMs[]              = "wm-user-time-ms";
 #endif
 
 #if defined(OS_MACOSX)
 // Prevents Chrome from quitting when Chrome Apps are open.
 const char kAppsKeepChromeAliveInTests[]    = "apps-keep-chrome-alive-in-tests";
 
 // Disable the toolkit-views App Info dialog for Mac.
 const char kDisableAppInfoDialogMac[] = "disable-app-info-dialog-mac";
 
@@ skipping 185 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR CRAP TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead, please
 // put them in alphabetical order above, or in order inside the appropriate
 // ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches