Add an end to end test: virtual keyboard opens on click of text input

ui/keyboard/keyboard_test_util.cc

Index: ui/keyboard/keyboard_test_util.cc
diff --git a/ui/keyboard/keyboard_test_util.cc b/ui/keyboard/keyboard_test_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..85c7048e6f83e1a990529fbf0a0a82ba04716904
--- /dev/null
+++ b/ui/keyboard/keyboard_test_util.cc
@@ -0,0 +1,61 @@
+// Copyright 2017 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 "ui/keyboard/keyboard_test_util.h"
+
+#include "base/run_loop.h"
+#include "ui/aura/window.h"
+#include "ui/aura/window_observer.h"
+#include "ui/keyboard/keyboard_controller.h"
+
+namespace {
+
+class WindowVisibilityChangeWaiter : public aura::WindowObserver {
+ public:
+  explicit WindowVisibilityChangeWaiter(aura::Window* window, bool wait_until)
+      : window_(window), wait_until_(wait_until) {
+    window_->AddObserver(this);
+  }
+  ~WindowVisibilityChangeWaiter() override { window_->RemoveObserver(this); }
+
+  void Wait() { run_loop_.Run(); }
+
+ private:
+  void OnWindowVisibilityChanged(aura::Window* window, bool visible) override {
+    if (window_ == window && visible == wait_until_) {
+      run_loop_.QuitWhenIdle();
+    }
+  }
+
+  aura::Window* window_;
+  base::RunLoop run_loop_;
+  bool const wait_until_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowVisibilityChangeWaiter);
+};
+
+bool WaitVisibilityChangesTo(bool visibility) {
+  aura::Window* keyboard_window =
+      keyboard::KeyboardController::GetInstance()
+          ->GetContainerWindowWithoutCreationForTest();
+  if (!keyboard_window)
+    return false;
+  WindowVisibilityChangeWaiter waiter(keyboard_window, visibility);
+  waiter.Wait();
+  return true;
+}
+
+}  // namespace
+
+namespace keyboard {
+
+bool WaitUntilShown() {
+  return WaitVisibilityChangesTo(true);
+}
+
+bool WaitUntilHidden() {
+  return WaitVisibilityChangesTo(false);
+}
+
+}  // namespace keyboard