Parent the AppInfoDialog using a ModalDialogHost

ui/app_list/views/contents_view.cc

Index: ui/app_list/views/contents_view.cc
diff --git a/ui/app_list/views/contents_view.cc b/ui/app_list/views/contents_view.cc
index 58323584b784aa5ab7a30fb2256baa6efbb94a3f..7e1a51a5eaa2c6c06fade848130f4e54c5fc3246 100644
--- a/ui/app_list/views/contents_view.cc
+++ b/ui/app_list/views/contents_view.cc
@@ -25,6 +25,7 @@
 #include "ui/resources/grit/ui_resources.h"
 #include "ui/views/view_model.h"
 #include "ui/views/view_model_utils.h"
+#include "ui/views/widget/widget.h"
 
 namespace app_list {
 
@@ -402,4 +403,22 @@ void ContentsView::TransitionChanged() {
   UpdatePageBounds();
 }
 
+gfx::NativeView ContentsView::GetHostView() const {
+  return GetWidget()->GetNativeView();
+}
+
+gfx::Point ContentsView::GetDialogPosition(const gfx::Size& size) {
+  gfx::Rect screen_bounds = GetBoundsInScreen();
+  return screen_bounds.origin();
+}
+
+void ContentsView::AddObserver(web_modal::ModalDialogHostObserver* observer) {
+  NOTIMPLEMENTED();
+}
+
+void ContentsView::RemoveObserver(
+    web_modal::ModalDialogHostObserver* observer) {
+  NOTIMPLEMENTED();
+}
+
 }  // namespace app_list