Disable VK overscroll for login/out-of-box.

ui/keyboard/keyboard_util.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_UTIL_H_
 #define UI_KEYBOARD_KEYBOARD_UTIL_H_
 
 #include <string>
 
 #include "base/strings/string16.h"
@@ skipping 20 matching lines @@
 };
 
 // An enumeration of different keyboard control events that should be logged.
 enum KeyboardControlEvent {
   KEYBOARD_CONTROL_SHOW = 0,
   KEYBOARD_CONTROL_HIDE_AUTO,
   KEYBOARD_CONTROL_HIDE_USER,
   KEYBOARD_CONTROL_MAX,
 };
 
+// An enumeration of keyboard overscroll override value.
+enum KeyboardOverscrolOverride {
+  KEYBOARD_OVERSCROLL_OVERRIDE_DISABLED = 0,
+  KEYBOARD_OVERSCROLL_OVERRIDE_ENABLED,
+  KEYBOARD_OVERSCROLL_OVERRIDE_NONE,
+};
+
 // Gets the default keyboard bounds from |window_bounds|.
 KEYBOARD_EXPORT gfx::Rect DefaultKeyboardBoundsFromWindowBounds(
     const gfx::Rect& window_bounds);
 
 // Gets the caculated keyboard bounds from |window_bounds|. The keyboard height
 // is specified by |keyboard_height|.
 KEYBOARD_EXPORT gfx::Rect KeyboardBoundsFromWindowBounds(
     const gfx::Rect& window_bounds, int keyboard_height);
 
 // Sets the state of the a11y onscreen keyboard.
@@ skipping 13 matching lines @@
 
 // Returns true if the virtual keyboard is enabled.
 KEYBOARD_EXPORT bool IsKeyboardEnabled();
 
 // Returns true if the keyboard usability test is enabled.
 KEYBOARD_EXPORT bool IsKeyboardUsabilityExperimentEnabled();
 
 // Returns true if keyboard overscroll mode is enabled.
 KEYBOARD_EXPORT bool IsKeyboardOverscrollEnabled();
 
+// Sets temporary keyboard overscroll override.
+KEYBOARD_EXPORT void SetKeyboardOverscrollOverride(
+    KeyboardOverscrolOverride override);
+
 // Returns true if an IME extension can specify a custom input view for the
 // virtual keyboard window.
 KEYBOARD_EXPORT bool IsInputViewEnabled();
 
 // Insert |text| into the active TextInputClient associated with |root_window|,
 // if there is one. Returns true if |text| was successfully inserted. Note
 // that this may convert |text| into ui::KeyEvents for injection in some
 // special circumstances (i.e. VKEY_RETURN, VKEY_BACK).
 KEYBOARD_EXPORT bool InsertText(const base::string16& text,
                                 aura::Window* root_window);
@@ skipping 37 matching lines @@
 
 // Gets the override content url.
 KEYBOARD_EXPORT const GURL& GetOverrideContentUrl();
 
 // Logs the keyboard control event as a UMA stat.
 void LogKeyboardControlEvent(KeyboardControlEvent event);
 
 }  // namespace keyboard
 
 #endif  // UI_KEYBOARD_KEYBOARD_UTIL_H_