New accessibility virtual keyboard behavior in non-sticky mode.

ui/base/ime/input_method_base.h

Index: ui/base/ime/input_method_base.h
diff --git a/ui/base/ime/input_method_base.h b/ui/base/ime/input_method_base.h
index 66a87ebf956775d7004b791920ac6cc7bc49af58..f189db7b15416ecf91e365bf32c8e5f9ee1f96e9 100644
--- a/ui/base/ime/input_method_base.h
+++ b/ui/base/ime/input_method_base.h
@@ -43,6 +43,7 @@ class UI_BASE_IME_EXPORT InputMethodBase
   void SetFocusedTextInputClient(TextInputClient* client) override;
   void DetachTextInputClient(TextInputClient* client) override;
   TextInputClient* GetTextInputClient() const override;
+  void SetAvailableBounds(const gfx::Rect& new_bounds) override;
 
   // If a derived class overrides this method, it should call parent's
   // implementation.
@@ -122,6 +123,10 @@ class UI_BASE_IME_EXPORT InputMethodBase
 
   std::vector<std::unique_ptr<ui::KeyEvent>> key_events_for_testing_;
 
+  // Screen bounds of root window not covered by virtual keyboard if it is
+  // active.
+  gfx::Rect available_bounds_;
+
   DISALLOW_COPY_AND_ASSIGN(InputMethodBase);
 };