Show composition window for IME-unaware PPAPI plugins on Windows.

ui/base/win/ime_input.h

Index: ui/base/win/ime_input.h
diff --git a/ui/base/win/ime_input.h b/ui/base/win/ime_input.h
index dc629e80977da2786e0b11f67e23f7ceb298ccc2..762b434b5ca5dbb563c28a33a215b93d569e69f0 100644
--- a/ui/base/win/ime_input.h
+++ b/ui/base/win/ime_input.h
@@ -227,6 +227,9 @@ class UI_EXPORT ImeInput {
   //     This rectangle is used for controlling the positions of IME windows.
   void UpdateCaretRect(HWND window_handle, const gfx::Rect& caret_rect);
 
+  // Updates the setting whether we want IME to render composition text.
+  void SetUseCompositionWindow(bool use_composition_window);
+
   // Returns the current input language id.
   LANGID input_language_id() const { return input_language_id_; }
 
@@ -305,6 +308,9 @@ class UI_EXPORT ImeInput {
   // The rectangle of the input caret retrieved from a renderer process.
   gfx::Rect caret_rect_;
 
+  // Indicates whether or not we want IME to render composition text.
+  bool use_composition_window_;
+
   DISALLOW_COPY_AND_ASSIGN(ImeInput);
 };