Support a private event - inputMethodPrivate.onCompositionBoundsChanged so that component IME exten…

ui/base/ime/chromeos/ime_bridge.h

Index: ui/base/ime/chromeos/ime_bridge.h
diff --git a/ui/base/ime/chromeos/ime_bridge.h b/ui/base/ime/chromeos/ime_bridge.h
index ff7d4fac781b7813ed7cf520418520eeb8e22196..7f432de109c0f3de3043ce20042f0b0f2a62aecd 100644
--- a/ui/base/ime/chromeos/ime_bridge.h
+++ b/ui/base/ime/chromeos/ime_bridge.h
@@ -102,6 +102,9 @@ class UI_BASE_EXPORT IMEEngineHandlerInterface {
   virtual void SetSurroundingText(const std::string& text, uint32 cursor_pos,
                                   uint32 anchor_pos) = 0;
 
+  // Called when the composition bounds changed.
+  virtual void SetCompositionBounds(const gfx::Rect& bounds) = 0;
+
  protected:
   IMEEngineHandlerInterface() {}
 };