Add test infrastructure for the file-picker modal test

chrome/browser/ui/libgtk2ui/select_file_dialog_interactive_uitest.cc

+// Copyright 2015 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 "chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.h"
+
+#include "base/run_loop.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_window.h"
+#include "chrome/browser/ui/chrome_select_file_policy.h"
+#include "chrome/browser/ui/view_ids.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/interactive_test_utils.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "net/test/embedded_test_server/embedded_test_server.h"
+#include "ui/shell_dialogs/select_file_dialog.h"
+#include "ui/views/widget/widget.h"
+#include "ui/views/widget/widget_observer.h"
+
+using BrowserSelectFileDialogTest = InProcessBrowserTest;
+
+// Spins a run loop until a Widget's activation reaches the desired state.
+class WidgetActivationWaiter : public views::WidgetObserver {
+ public:
+  WidgetActivationWaiter(views::Widget* widget, bool active)
+      : observed_(false), active_(active) {
+    widget->AddObserver(this);
+    EXPECT_NE(active, widget->IsActive());
+  }
+
+  void Wait() {
+    if (!observed_)
+      run_loop_.Run();
+  }
+
+ private:
+  // views::WidgetObserver:
+  void OnWidgetActivationChanged(views::Widget* widget, bool active) override {
+    if (active_ != active)
+      return;
+
+    observed_ = true;
+    widget->RemoveObserver(this);
+    if (run_loop_.running())
+      run_loop_.Quit();
+  }
+
+  base::RunLoop run_loop_;
+  bool observed_;
+  bool active_;
+
+  DISALLOW_COPY_AND_ASSIGN(WidgetActivationWaiter);
+};
+
+namespace libgtk2ui {
+
+// FilePicker opens a GtkFileChooser.
+class FilePicker : public ui::SelectFileDialog::Listener {
+ public:
+  explicit FilePicker(BrowserWindow* window) {
+    select_file_dialog_ = ui::SelectFileDialog::Create(
+        this, new ChromeSelectFilePolicy(nullptr));
+
+    gfx::NativeWindow parent_window = window->GetNativeWindow();
+    ui::SelectFileDialog::FileTypeInfo file_types;
+    file_types.support_drive = true;
+    const base::FilePath file_path;
+    select_file_dialog_->SelectFile(ui::SelectFileDialog::SELECT_OPEN_FILE,
+                                    base::string16(),
+                                    file_path,
+                                    &file_types,
+                                    0,
+                                    base::FilePath::StringType(),
+                                    parent_window,
+                                    nullptr);
+  }
+
+  ~FilePicker() override {
+    select_file_dialog_->ListenerDestroyed();
+  }
+
+  void Close() {
+    SelectFileDialogImplGTK* file_dialog =
+        static_cast<SelectFileDialogImplGTK*>(select_file_dialog_.get());
+
+
+    while (!file_dialog->dialogs_.empty())
+      gtk_widget_destroy(*(file_dialog->dialogs_.begin()));
+  }
+
+  // SelectFileDialog::Listener implementation.
+  void FileSelected(const base::FilePath& path,
+                    int index,
+                    void* params) override {}
+ private:
+  // Dialog box used for opening and saving files.
+  scoped_refptr<ui::SelectFileDialog> select_file_dialog_;
+
+  DISALLOW_COPY_AND_ASSIGN(FilePicker);
+};
+
+}  // namespace libgtk2ui