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

ui/views/widget/widget.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.
 
 #ifndef UI_VIEWS_WIDGET_WIDGET_H_
 #define UI_VIEWS_WIDGET_WIDGET_H_
 
 #include <set>
 #include <stack>
 #include <vector>
@@ skipping 198 matching lines @@
     // aura::Window. Default is LAYER_TEXTURED.
     ui::LayerType layer_type;
     // Only used by Aura. Provides a context window whose RootWindow is
     // consulted during widget creation to determine where in the Window
     // hierarchy this widget should be placed. (This is separate from |parent|;
     // if you pass a RootWindow to |parent|, your window will be parented to
     // |parent|. If you pass a RootWindow to |context|, we ask that RootWindow
     // where it wants your window placed.) NULL is not allowed if you are using
     // aura.
     gfx::NativeView context;
+    // Only used by X11, for root level windows. Specifies the res_name and
+    // res_class fields, respectively, of the WM_CLASS window property. Controls
+    // window grouping and desktop file matching in Linux window managers.
+    std::string wm_class_name;
+    std::string wm_class_class;
   };
 
   Widget();
   virtual ~Widget();
 
   // Creates a toplevel window with no context. These methods should only be
   // used in cases where there is no contextual information because we're
   // creating a toplevel window connected to no other event.
   //
   // If you have any parenting or context information, or can pass that
@@ skipping 627 matching lines @@
   // True when window movement via mouse interaction with the frame should be
   // disabled.
   bool movement_disabled_;
 
   DISALLOW_COPY_AND_ASSIGN(Widget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_WIDGET_H_