The on screen keyboard on Windows 8+ should not obscure the input field.

ui/base/win/osk_display_manager.h

+// Copyright 2016 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_BASE_WIN_OSK_DISPLAY_MANAGER_H_
+#define UI_BASE_WIN_OSK_DISPLAY_MANAGER_H_
+
+#include "base/memory/singleton.h"
+#include "base/memory/weak_ptr.h"
+#include "base/observer_list.h"
+#include "base/strings/string16.h"
+#include "ui/base/ui_base_export.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace ui {
+
+// Implemented by classes who wish to get notified about the on screen keyboard
+// becoming visible/hidden.
+class UI_BASE_EXPORT OnScreenKeyboardObserver {

[sky, 2016/05/19 16:05:26]

nit: move to own header.

[ananta, 2016/05/19 19:33:38]

Done.

+ public:
+  virtual ~OnScreenKeyboardObserver() {}
+
+  // The |keyboard_rect| parameter contains the bounds of the keyboard in DIPs.
+  virtual void OnKeyboardVisible(const gfx::Rect& keyboard_rect_in_dips) {}
+  virtual void OnKeyboardHidden(const gfx::Rect& keyboard_rect_in_dips) {}
+};
+
+// This class provides functionality to detect when the on screen keyboard
+// is displayed and move the main window up if it is obscured by the keyboard.
+class UI_BASE_EXPORT OnScreenKeyboardDetector {
+ public:
+  OnScreenKeyboardDetector();
+  ~OnScreenKeyboardDetector();
+
+  // Schedules a delayed task which detects if the on screen keyboard was
+  // displayed.
+  void DetectKeyboard(HWND main_window);
+
+  // Dismisses the on screen keyboard.
+  bool DismissKeyboard();
+
+  // Add/Remove keyboard observers.
+  // Please note that this class does not track the |observer| destruction. It
+  // is upto the classes which set up these observers to remove them when they
+  // are destroyed.
+  void AddObserver(OnScreenKeyboardObserver* observer);
+  void RemoveObserver(OnScreenKeyboardObserver* observer);
+
+ private:
+  // Executes as a task and detects if the on screen keyboard is displayed.
+  // The |check_for_activation| parameter controls whether the function detects
+  // whether the keyboard wad displayed or hidden.
+  // Once the OSK is detected, this task runs periodically for the duration for
+  // which the OSK is visible.
+  void CheckOSKState(bool check_for_activation);
+
+  // Notifies observers that the keyboard was displayed.
+  // A recurring task CheckOSKState() is started to detect when the OSK
+  // disappears.
+  void HandleKeyboardVisible();
+
+  // Notifies observers that the keyboard was hidden.
+  // The observer list is cleared out after this notification.
+  void HandleKeyboardHidden();
+
+  // Removes all observers from the list.
+  void ClearObservers();
+
+  // The main window which displays the on screen keyboard.
+  HWND main_window_;
+
+  // Tracks if the keyboard was displayed.
+  bool osk_visible_notification_received_;
+
+  // The keyboard dimensions in DIPs.
+  gfx::Rect osk_rect_dip_;
+
+  base::ObserverList<OnScreenKeyboardObserver, false> observers_;
+
+  // Should be the last member in the class. Helps ensure that tasks spawned
+  // by this class instance are canceled when it is destroyed.
+  base::WeakPtrFactory<OnScreenKeyboardDetector> keyboard_detector_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(OnScreenKeyboardDetector);
+};
+
+// This class provides functionality to display the on screen keyboard on
+// Windows 8+. It optionally notifies observers that the OSK is displayed,
+// hidden, etc.
+class UI_BASE_EXPORT OnScreenKeyboardDisplayManager {

[sky, 2016/05/19 16:05:26]

Why do we need two classes for managing keyboards? I get that the keyboard is
different in win8, but that's an implementation detail.
Can we have one public class here, and if that needs to call off to differently
implementations, fine. But consumers only care about the single class.

[ananta, 2016/05/19 19:33:38]

Done.

+ public:
+  static OnScreenKeyboardDisplayManager* GetInstance();
+
+  ~OnScreenKeyboardDisplayManager();
+
+  // Functions to display and dismiss the keyboard.
+  // The |observer| parameters allow the caller to optionally set up
+  // notification observers for detecting when the keyboard is displayed
+  // hidden etc.
+  bool DisplayVirtualKeyboard(OnScreenKeyboardObserver* observer);
+  bool DismissVirtualKeyboard();
+
+ private:
+  OnScreenKeyboardDisplayManager();
+
+  friend struct base::DefaultSingletonTraits<OnScreenKeyboardDisplayManager>;
+
+  std::unique_ptr<OnScreenKeyboardDetector> keyboard_detector_;
+
+  // The location of TabTip.exe.
+  base::string16 osk_path_;
+
+  DISALLOW_COPY_AND_ASSIGN(OnScreenKeyboardDisplayManager);
+};
+
+// Displays the on screen keyboard on Windows 8 and above. Returns true on
+// success.
+UI_BASE_EXPORT bool DisplayVirtualKeyboard();
+
+// Dismisses the on screen keyboard if it is being displayed on Windows 8 and.
+// above. Returns true on success.
+UI_BASE_EXPORT bool DismissVirtualKeyboard();
+
+}  // namespace ui
+
+#endif  // UI_BASE_WIN_OSK_DISPLAY_MANAGER_H_