Add BrowserSelectFileDialogTest.OpenCloseFileDialog

chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc

Index: chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
diff --git a/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc b/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
index 6a0cb7cb8957ab5ace97619c5bbc2c51ddd44b7f..66672a8cb42c44fe757440fe5e68b270b4a71dc9 100644
--- a/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
+++ b/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
@@ -29,6 +29,7 @@
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 #include "ui/strings/grit/ui_strings.h"
+#include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 #include "ui/views/widget/desktop_aura/x11_desktop_handler.h"
 
 namespace {
@@ -73,6 +74,8 @@ class SelectFileDialogImplGTK : public SelectFileDialogImpl,
                       const base::FilePath::StringType& default_extension,
                       gfx::NativeWindow owning_window,
                       void* params) override;
+  // Close the file dialog.
+  void CloseImpl() override;
 
  private:
   bool HasMultipleFileTypeChoicesImpl() override;
@@ -289,6 +292,25 @@ void SelectFileDialogImplGTK::SelectFileImpl(
   gtk_window_present_with_time(GTK_WINDOW(dialog), time);
 }
 
+// Close the file-picker by sending an ESC key event to it.
+void SelectFileDialogImplGTK::CloseImpl() {
+  // Get the focused window.

[msw, 2015/10/16 17:01:04]

Can we ensure this is the dialog window somehow? Otherwise, this function just
sends the Esc key to whatever window has input focus, and that seems quite
wrong.

[joone, 2015/10/16 23:33:46]

Yes, because the file-picker is modal.

+  XID focused_window;
+  int revert;
+  XGetInputFocus(gfx::GetXDisplay(), &focused_window, &revert);
+
+  // Send an ESC key event to the focused_window.
+  XKeyEvent event;
+  memset(&event, 0, sizeof(event));
+  event.display = gfx::GetXDisplay();
+  event.window = focused_window;
+  event.keycode = XKeysymToKeycode(gfx::GetXDisplay(), XK_Escape);
+  event.type = KeyPress;
+
+  XSendEvent(gfx::GetXDisplay(), focused_window, True, KeyPressMask,
+      reinterpret_cast<XEvent*>(&event));
+}
+
 void SelectFileDialogImplGTK::AddFilters(GtkFileChooser* chooser) {
   for (size_t i = 0; i < file_types_.extensions.size(); ++i) {
     GtkFileFilter* filter = NULL;