Set the WM_CLASS property of X11 windows in Linux Aura build.

ui/base/x/x11_util.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.
 
 // This file defines utility functions for X11 (Linux only). This code has been
 // ported from XCB since we can't use XCB on Ubuntu while its 32-bit support
 // remains woefully incomplete.
 
 #include "ui/base/x/x11_util.h"
 
@@ skipping 994 matching lines @@
 Atom GetAtom(const char* name) {
 #if defined(TOOLKIT_GTK)
   return gdk_x11_get_xatom_by_name_for_display(
       gdk_display_get_default(), name);
 #else
   // TODO(derat): Cache atoms to avoid round-trips to the server.
   return XInternAtom(GetXDisplay(), name, false);
 #endif
 }
 
+void SetWindowClassHint(Display* display,
+                        XID window,
+                        std::string res_name,
+                        std::string res_class) {
+  XClassHint class_hints;
+  // const_cast is safe because XSetClassHint does not modify the strings.
+  // Just to be safe, the res_name and res_class parameters are local copies,
+  // not const references.
+  class_hints.res_name = const_cast<char*>(res_name.c_str());
+  class_hints.res_class = const_cast<char*>(res_class.c_str());
+  XSetClassHint(display, window, &class_hints);
+}
+
 XID GetParentWindow(XID window) {
   XID root = None;
   XID parent = None;
   XID* children = NULL;
   unsigned int num_children = 0;
   XQueryTree(GetXDisplay(), window, &root, &parent, &children, &num_children);
   if (children)
     XFree(children);
   return parent;
 }
@@ skipping 702 matching lines @@
       << "request_code " << static_cast<int>(error_event.request_code) << ", "
       << "minor_code " << static_cast<int>(error_event.minor_code)
       << " (" << request_str << ")";
 }
 
 // ----------------------------------------------------------------------------
 // End of x11_util_internal.h
 
 
 }  // namespace ui