Add ExtendSelectionAndDelete() method to ui::TextInputClient.

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 1ecc19063aa85a614cb6373761bae79cfae3082d..0895167adea74961fa465d74bca6d1dbf0fe69b5 100644
--- a/ui/base/ime/text_input_client.h
+++ b/ui/base/ime/text_input_client.h
@@ -127,6 +127,10 @@ class UI_EXPORT TextInputClient {
   // Returns false if the operation is not supported.
   virtual bool ChangeTextDirectionAndLayoutAlignment(
       base::i18n::TextDirection direction) = 0;
+
+  // Deletes the current selection plus the specified number of characters
+  // before and after the selection or caret.
+  virtual void ExtendSelectionAndDelete(size_t before, size_t after) = 0;
 };
 
 }  // namespace ui