Do not filter the picker window with Aura.

chrome/browser/ui/views/desktop_media_picker_views.cc

Index: chrome/browser/ui/views/desktop_media_picker_views.cc
diff --git a/chrome/browser/ui/views/desktop_media_picker_views.cc b/chrome/browser/ui/views/desktop_media_picker_views.cc
index 9b1f2f18d16abd17d6f372111deb483970c6fc10..6fad249bc487ab32c875fff5cb448040c14d71ea 100644
--- a/chrome/browser/ui/views/desktop_media_picker_views.cc
+++ b/chrome/browser/ui/views/desktop_media_picker_views.cc
@@ -546,23 +546,9 @@ DesktopMediaPickerDialogView::DesktopMediaPickerDialogView(
   else
     widget = DialogDelegate::CreateDialogWidget(this, context, parent_window);
 
-  // DesktopMediaList needs to know the ID of the picker window which
-  // matches the ID it gets from the OS. Depending on the OS and configuration
-  // we get this ID differently.
-  content::DesktopMediaID::Id dialog_window_id = 0;
-#if defined(USE_ASH)
-  if (chrome::IsNativeWindowInAsh(widget->GetNativeWindow())) {
-    dialog_window_id = content::DesktopMediaID::RegisterAuraWindow(
-        widget->GetNativeWindow()).id;
-    DCHECK_NE(dialog_window_id, 0);
-  }
-#endif
-  if (dialog_window_id == 0) {
-    dialog_window_id = AcceleratedWidgetToDesktopMediaId(
-        widget->GetNativeWindow()->GetHost()->GetAcceleratedWidget());
-  }
-
-  list_view_->StartUpdating(dialog_window_id);
+  // The picker window is embedded in the parent window and does not have its
+  // own native window with Aura. So we do not filter any window.

[Sergey Ulanov, 2014/06/13 17:38:41]

Actually it's not always the case. We still have a separate dialog window in
some cases - see line 547. 
If CreateWebModalDialogView() is used to create the dialog, then we don't want
to filter it, but we still want filtering when the dialog is created using
DialogDelegate::CreateDialogWidget()

[jiayl, 2014/06/13 17:54:54]

But I tested both the desktopCapture example extension (i.e. CreateDialogWidget)
code path and the tab delegated code path (i.e. createWebModalDialogViews), the
picker dialog is not listed in the picker without filtering.

+  list_view_->StartUpdating(0);
 
   if (parent_web_contents) {
     web_modal::WebContentsModalDialogManager* manager =