[FYI] All-in-one OnCandidateWindow{Show,Update,Hide}

ui/base/ime/text_input_client.h

Index: ui/base/ime/text_input_client.h
diff --git a/ui/base/ime/text_input_client.h b/ui/base/ime/text_input_client.h
index 81588467d90b1b8c6dcd1ed121f5a3672f483209..d03dc63e939e8e9a1b0257cc3ea08339b81e1b7a 100644
--- a/ui/base/ime/text_input_client.h
+++ b/ui/base/ime/text_input_client.h
@@ -147,6 +147,13 @@ class UI_EXPORT TextInputClient {
   // Ensure the caret is within |rect|.  |rect| is in screen coordinates and
   // may extend beyond the bounds of this TextInputClient.
   virtual void EnsureCaretInRect(const gfx::Rect& rect) = 0;
+
+  // Called when IME shows a candidate window for the ongoing composition.
+  virtual void OnCandidateWindowShow() = 0;
+  // Called when IME updates any appearance of the current candidate window.
+  virtual void OnCandidateWindowUpdate() = 0;
+  // Called when IME hides the candidate window.
+  virtual void OnCandidateWindowHide() = 0;
 };
 
 }  // namespace ui