New accessibility virtual keyboard behavior in non-sticky mode.

ui/base/ime/text_input_client.h

 // Copyright (c) 2012 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_IME_TEXT_INPUT_CLIENT_H_
 #define UI_BASE_IME_TEXT_INPUT_CLIENT_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 141 matching lines @@
   // instead of calling DeleteRange with GetSelectionRange, because
   // GetSelectionRange may not be the latest value due to asynchronous of IPC
   // between browser and renderer.
   virtual void ExtendSelectionAndDelete(size_t before, size_t after) = 0;
 
   // Ensure the caret is not in |rect|.  |rect| is in screen coordinates in
   // DIP (Density Independent Pixel) and may extend beyond the bounds of this
   // TextInputClient.
   virtual void EnsureCaretNotInRect(const gfx::Rect& rect) = 0;
 
+  // Called when this input client is no longer focused. Used to restore window
+  // bounds when moved by accessibility virtual keyboard.
+  virtual void OnClientFocusLost() {}

[Shu Chen, 2017/03/14 14:42:30]

Why adding this? RWHVA is a FocusChangeObserver and TextField is a View which
has View::OnBlur.

[yhanada, 2017/03/15 12:54:32]

This will also be called when VK size is changed for some reason or VK moves to
another display.

+
   // Returns true if |command| is currently allowed to be executed.
   virtual bool IsTextEditCommandEnabled(TextEditCommand command) const = 0;
 
   // Execute |command| on the next key event. This allows a TextInputClient to
   // be informed of a platform-independent edit command that has been derived
   // from the key event currently being dispatched (but not yet sent to the
   // TextInputClient). The edit command will take into account any OS-specific,
   // or user-specified, keybindings that may be set up.
   virtual void SetTextEditCommandForNextKeyEvent(TextEditCommand command) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_TEXT_INPUT_CLIENT_H_