Adding 'Always on top' behavior to the It2Me Confirmation Dialog

remoting/host/it2me/it2me_confirmation_dialog_win.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 <windows.h>
 #include <commctrl.h>
 
 #include <cstdint>
 #include <memory>
 #include <string>
@@ skipping 185 matching lines @@
     // flash the placeholder on the taskbar.  Do not call SetForegroundWindow()
     // multiple times as it will cause annoying flashing for the user.
     It2MeConfirmationDialogWin* dialog =
         reinterpret_cast<It2MeConfirmationDialogWin*>(ref_data);
     if (hwnd == GetForegroundWindow()) {
       dialog->is_foreground_window_ = true;
     } else if (dialog->is_foreground_window_) {
       SetForegroundWindow(hwnd);
       dialog->is_foreground_window_ = false;
     }
+
+    if (!dialog->is_foreground_window_) {
+      // Ensure the dialog is always at the top of the top-most window stack,
+      // even if it doesn't have focus, so the user can always see it.
+      BringWindowToTop(hwnd);
+    }
+  } else if (notification == TDN_CREATED) {
+    // After the dialog has been created, but before it is visible, set its
+    // z-order so it will be a top-most window and have always on top behavior.
+    if (!SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, 0, 0,
+                      SWP_NOMOVE | SWP_NOSIZE)) {
+      PLOG(ERROR) << "SetWindowPos() failed";
+    }
   }
 
   return S_OK;
 }
 
 }  // namespace
 
 // static
 std::unique_ptr<It2MeConfirmationDialog> It2MeConfirmationDialog::Create() {
   return base::MakeUnique<It2MeConfirmationDialogWin>();
 }
 
 }  // namespace remoting