Reland the patch to fix the problem that sometimes panel on Windows is not set to top-most.

chrome/browser/ui/views/frame/browser_frame.cc

 // Copyright (c) 2011 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 "chrome/browser/ui/views/frame/browser_frame.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/themes/theme_service.h"
 #include "chrome/browser/themes/theme_service_factory.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 32 matching lines @@
       NativeBrowserFrame::CreateNativeBrowserFrame(this, browser_view_);
   views::Widget::InitParams params;
   params.delegate = browser_view_;
   params.native_widget = native_browser_frame_->AsNativeWidget();
   if (browser_view_->browser()->is_type_tabbed()) {
     // Typed panel/popup can only return a size once the widget has been
     // created.
     params.bounds = browser_view_->browser()->GetSavedWindowBounds();
     params.show_state = browser_view_->browser()->GetSavedWindowShowState();
   }
+  if (browser_view_->browser()->is_type_panel()) {
+    // We need to set the top-most bit when the panel window is created.
+    // There is a Windows bug/feature that would very likely prevent the window
+    // from being changed to top-most after the window is created without
+    // activation.
+    params.keep_on_top = true;
+  }
   Init(params);
 #if defined(OS_CHROMEOS)
   // On ChromeOS we always want top-level windows to appear active.
   if (!browser_view_->IsBrowserTypePopup())
     DisableInactiveRendering();
 #endif
 }
 
 int BrowserFrame::GetMinimizeButtonOffset() const {
   return native_browser_frame_->GetMinimizeButtonOffset();
@@ skipping 71 matching lines @@
     // When running under remote desktop, if the remote desktop client is not
     // active on the users desktop, then none of the windows contained in the
     // remote desktop will be activated.  However, NativeWidgetWin::Activate()
     // will still bring this browser window to the foreground.  We explicitly
     // set ourselves as the last active browser window to ensure that we get
     // treated as such by the rest of Chrome.
     BrowserList::SetLastActive(browser_view_->browser());
   }
   Widget::OnNativeWidgetActivationChanged(active);
 }