Add new gpu driver bug workaround DISABLE_TRANSPARENT_VISUALS

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.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 "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 
 #include <X11/extensions/shape.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xregion.h>
@@ skipping 1129 matching lines @@
   }
   // An in-activatable window should not interact with the system wm.
   if (!activatable_)
     swa.override_redirect = True;
 
   if (swa.override_redirect)
     attribute_mask |= CWOverrideRedirect;
 
   Visual* visual;
   int depth;
-  ui::ChooseVisualForWindow(&visual, &depth);
+  ui::ChooseVisualForWindow(true, &visual, &depth);

[sadrul, 2016/07/15 15:12:13]

true /* enable_transparent_visuals */

In old code, this used to default to false, yes?

   if (depth == 32) {
     attribute_mask |= CWColormap;
     swa.colormap =
         XCreateColormap(xdisplay_, x_root_window_, visual, AllocNone);
 
     // x.org will BadMatch if we don't set a border when the depth isn't the
     // same as the parent depth.
     attribute_mask |= CWBorderPixel;
     swa.border_pixel = 0;
 
@@ skipping 922 matching lines @@
   if (linux_ui) {
     ui::NativeTheme* native_theme = linux_ui->GetNativeTheme(window);
     if (native_theme)
       return native_theme;
   }
 
   return ui::NativeThemeAura::instance();
 }
 
 }  // namespace views