Move the 'Exit session' button to the most left side in the system tray.

ash/common/system/chromeos/palette/palette_tray.cc

 // Copyright 2016 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 "ash/common/system/chromeos/palette/palette_tray.h"
 
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shelf/shelf_constants.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shelf/wm_shelf_util.h"
@@ skipping 309 matching lines @@
 
   // Move the palette to the left so the right edge of the palette aligns with
   // the right edge of the tray button.
   if (IsHorizontalAlignment(shelf_alignment())) {
     // TODO(jdufault): Figure out a more robust adjustment method that does not
     // break in md-shelf.
     int icon_size = tray_container()->width();
     if (tray_container()->border())
       icon_size -= tray_container()->border()->GetInsets().width();
 
-    r.Offset(-r.width() + icon_size, 0);
+    r.Offset(-r.width() + icon_size + x(), 0);
   } else {
     // Vertical layout doesn't need the border adjustment that horizontal needs.
     r.Offset(0, -r.height() + tray_container()->height());
   }
 
   return r;
 }
 
 void PaletteTray::OnBeforeBubbleWidgetInit(
     views::Widget* anchor_widget,
@@ skipping 116 matching lines @@
   } else {
     UpdateIconVisibility();
   }
 }
 
 void PaletteTray::UpdateIconVisibility() {
   SetVisible(IsInUserSession());
 }
 
 }  // namespace ash