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

ui/keyboard/keyboard_controller.h

 // Copyright (c) 2013 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.
 
 #ifndef UI_KEYBOARD_KEYBOARD_CONTROLLER_H_
 #define UI_KEYBOARD_KEYBOARD_CONTROLLER_H_
 
 #include <memory>
 
 #include "base/event_types.h"
@@ skipping 46 matching lines @@
     HIDE_REASON_AUTOMATIC,
     // User initiated.
     HIDE_REASON_MANUAL,
   };
 
   // Takes ownership of |ui|.
   explicit KeyboardController(KeyboardUI* ui, KeyboardLayoutDelegate* delegate);
   ~KeyboardController() override;
 
   // Returns the container for the keyboard, which is owned by
-  // KeyboardController.
+  // KeyboardController. Creates the container if it's not already created.
   aura::Window* GetContainerWindow();
 
+  // Same as GetContainerWindow except that this function doesn't create the
+  // window.
+  aura::Window* GetContainerWindowWithoutCreationForTest();
+
   // Whether the container window for the keyboard has been initialized.
   bool keyboard_container_initialized() const { return container_ != nullptr; }
 
   // Reloads the content of the keyboard. No-op if the keyboard content is not
   // loaded yet.
   void Reload();
 
   // Hides virtual keyboard and notifies observer bounds change.
   // This function should be called with a delay to avoid layout flicker
   // when the focus of input field quickly change. |automatic| is true when the
@@ skipping 107 matching lines @@
   static KeyboardController* instance_;
 
   base::WeakPtrFactory<KeyboardController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardController);
 };
 
 }  // namespace keyboard
 
 #endif  // UI_KEYBOARD_KEYBOARD_CONTROLLER_H_