Delayed loading of the virtual keyboard.

ui/base/ime/input_method_observer.h

Index: ui/base/ime/input_method_observer.h
diff --git a/ui/base/ime/input_method_observer.h b/ui/base/ime/input_method_observer.h
index 84de8af5493da75d1c2dd4810b5d40144f6e7284..195da9c48934fea7f857c39fafcab2ece9de5f35 100644
--- a/ui/base/ime/input_method_observer.h
+++ b/ui/base/ime/input_method_observer.h
@@ -9,6 +9,7 @@
 
 namespace ui {
 
+class InputMethod;
 class TextInputClient;
 
 class UI_EXPORT InputMethodObserver {
@@ -19,6 +20,9 @@ class UI_EXPORT InputMethodObserver {
   //  - the TextInputClient is changed (e.g. by a change of focus)
   //  - the TextInputType of the TextInputClient changes
   virtual void OnTextInputStateChanged(const TextInputClient* client) = 0;
+
+  // Called when the observed InputMethod is being destroyed.
+  virtual void OnInputMethodDestroyed(const InputMethod* input_method) = 0;
 };
 
 }  // namespace ui