Add Reset() to IBusController.

chrome/browser/chromeos/input_method/ibus_controller.h

Index: chrome/browser/chromeos/input_method/ibus_controller.h
diff --git a/chrome/browser/chromeos/input_method/ibus_controller.h b/chrome/browser/chromeos/input_method/ibus_controller.h
index 58d6877f84fb20780067f0223d78bdae84d324df..c116468c6b7855f36cc83acc01a375ef19863660 100644
--- a/chrome/browser/chromeos/input_method/ibus_controller.h
+++ b/chrome/browser/chromeos/input_method/ibus_controller.h
@@ -39,6 +39,10 @@ class IBusController {
   // Starts the system input method framework. No-op if it's already started.
   virtual bool Start() = 0;
 
+  // Resets the system input method framework. A composition text is discarded,
+  // and a candidate window is closed.
+  virtual void Reset() = 0;
+
   // Stops the system input method framework.
   virtual bool Stop() = 0;