Disabled transparency for header bars on the signin screen.

ash/wm/frame_painter.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 "ash/wm/frame_painter.h"
 
 #include "ash/ash_constants.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/property_util.h"
@@ skipping 773 matching lines @@
       return (hit_code == HTBOTTOMRIGHT ||
               hit_code == HTBOTTOM ||
               hit_code == HTBOTTOMLEFT) ? HTBOTTOM : HTNOWHERE;
     }
   }
   return hit_code;
 }
 
 bool FramePainter::UseSoloWindowHeader() {
   aura::RootWindow* root = window_->GetRootWindow();
-  if (!root)
+  if (!root || root->GetProperty(internal::kIgnoreSoloWindowFramePainterPolicy))
     return false;
-
   return (root->GetProperty(internal::kSoloWindowFramePainterKey) == this);
 }
 
 // static
 FramePainter* FramePainter::GetSoloPainterInRoot(RootWindow* root_window,
                                                  Window* ignorable_window) {
   // Can be NULL in tests that don't use FramePainter windows.
   if (!instances_)
     return NULL;
 
@@ skipping 67 matching lines @@
   int title_y =
       (view->GetBoundsForClientView().y() - title_font.GetHeight()) / 2;
   return gfx::Rect(
       title_x,
       std::max(0, title_y),
       std::max(0, size_button_->x() - kTitleLogoSpacing - title_x),
       title_font.GetHeight());
 }
 
 }  // namespace ash