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

Index: remoting/host/plugin/daemon_installer_win.cc
diff --git a/remoting/host/plugin/daemon_installer_win.cc b/remoting/host/plugin/daemon_installer_win.cc
index 9d7e524f81f9362b25fdacac4f9b9e0b93563531..365194e41f1aca65c5ba8ac3525983b1689bbb3a 100644
--- a/remoting/host/plugin/daemon_installer_win.cc
+++ b/remoting/host/plugin/daemon_installer_win.cc
@@ -332,12 +332,13 @@ void DaemonInstallerWin::Done(HRESULT 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;
@@ -365,4 +366,25 @@ scoped_ptr<DaemonInstallerWin> DaemonInstallerWin::Create(
   }
 }
 
+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