Add support for X11 workspaces

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
index effa86484cfe77eed5aa00794ace06f8a866a8a6..d54f7b5cd74cb1566acd2efb18f03abd40b74209 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
@@ -1226,6 +1226,9 @@ void DesktopWindowTreeHostX11::InitX11Window(
   if (params.visible_on_all_workspaces) {
     state_atom_list.push_back(atom_cache_.GetAtom("_NET_WM_STATE_STICKY"));
     ui::SetIntProperty(xwindow_, "_NET_WM_DESKTOP", "CARDINAL", kAllDesktops);
+  } else if (params.workspace != -1) {
+    ui::SetIntProperty(xwindow_, "_NET_WM_DESKTOP", "CARDINAL",
+                       params.workspace);
   }
 
   // Setting _NET_WM_STATE by sending a message to the root_window (with
@@ -1994,6 +1997,11 @@ uint32_t DesktopWindowTreeHostX11::DispatchEvent(
         OnWMStateUpdated();
       else if (changed_atom == atom_cache_.GetAtom("_NET_FRAME_EXTENTS"))
         OnFrameExtentsUpdated();
+      else if (changed_atom == atom_cache_.GetAtom("_NET_WM_DESKTOP")) {

[sky, 2016/04/29 17:05:45]

when you add {} to one branch, then add {} to all branches.

[Tom (Use chromium acct), 2016/04/29 19:14:04]

Done.

+        int workspace_id;
+        if (ui::GetIntProperty(xwindow_, "_NET_WM_DESKTOP", &workspace_id))
+          OnHostWorkspaceChanged(workspace_id);
+      }
       break;
     }
     case SelectionNotify: {