Making sure that UAC promts fired by the Chromoting plugin get focus (instead of being shown in the…

remoting/host/plugin/daemon_installer_win.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 "remoting/host/plugin/daemon_installer_win.h"
 
 #include <windows.h>
 
 #include "base/bind.h"
 #include "base/message_loop.h"
@@ skipping 314 matching lines @@
 
 DaemonInstallerWin::~DaemonInstallerWin() {
 }
 
 void DaemonInstallerWin::Done(HRESULT result) {
   done_.Run(result);
 }
 
 // static
 scoped_ptr<DaemonInstallerWin> DaemonInstallerWin::Create(
+    void* window_handle,
     CompletionCallback done) {
   // Check if the machine instance of Omaha is available.
   BIND_OPTS3 bind_options;
   memset(&bind_options, 0, sizeof(bind_options));
   bind_options.cbStruct = sizeof(bind_options);
-  bind_options.hwnd = NULL;
+  bind_options.hwnd = GetTopLevelWindow(reinterpret_cast<HWND>(window_handle));
   bind_options.dwClassContext = CLSCTX_LOCAL_SERVER;
 
   ScopedComPtr<omaha::IGoogleUpdate3Web> update3;
   HRESULT result = ::CoGetObject(
       kOmahaElevationMoniker,
       &bind_options,
       omaha::IID_IGoogleUpdate3Web,
       update3.ReceiveVoid());
   if (SUCCEEDED(result)) {
     // The machine instance of Omaha is available and we successfully passed
     // the UAC prompt.
     return scoped_ptr<DaemonInstallerWin>(
         new DaemonComInstallerWin(update3, done));
   } else if (result == CO_E_CLASSSTRING) {
     // The machine instance of Omaha is not available so we will have to run
     // GoogleUpdate.exe manually passing "needsadmin=True". This will cause
     // Omaha to install the machine instance first and then install Chromoting
     // Host.
     return scoped_ptr<DaemonInstallerWin>(
         new DaemonCommandLineInstallerWin(done));
   } else {
     // The user declined the UAC prompt or some other error occured.
     done.Run(result);
     return scoped_ptr<DaemonInstallerWin>();
   }
 }
 
+HWND GetTopLevelWindow(HWND window) {
+  if (window == NULL) {
+    return NULL;
+  }
+
+  for (;;) {
+    LONG style = GetWindowLong(window, GWL_STYLE);
+    if ((style & WS_OVERLAPPEDWINDOW) == WS_OVERLAPPEDWINDOW ||
+        (style & WS_POPUP) == WS_POPUP) {
+      return window;
+    }
+
+    HWND parent = GetAncestor(window, GA_PARENT);
+    if (parent == NULL) {
+      return window;
+    }
+
+    window = parent;
+  }
+}
+
 }  // namespace remoting