Add more out of line copy ctors for complex classes.

ui/platform_window/text_input_state.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_PLATFORM_WINDOW_TEXT_INPUT_STATE_H_
 #define UI_PLATFORM_WINDOW_TEXT_INPUT_STATE_H_
 
 #include <string>
 
 #include "ui/base/ime/text_input_flags.h"
 #include "ui/base/ime/text_input_type.h"
 
 namespace ui {
 
 // Text input info which is based on blink::WebTextInputInfo.
 struct TextInputState {
   TextInputState();
   TextInputState(TextInputType type,
                  int flags,
                  const std::string& text,
                  int selection_start,
                  int selection_end,
                  int composition_start,
                  int composition_end,
                  bool can_compose_inline);
+  TextInputState(const TextInputState& other);
   bool operator==(const TextInputState& other) const;
 
   // The type of input field.
   TextInputType type;
 
   // The flags of the input field (autocorrect, autocomplete, etc.).
   int flags;
 
   // The value of the input field.
   std::string text;
@@ skipping 12 matching lines @@
   // The end position of the current composition, or -1 if there is none.
   int composition_end;
 
   // Whether or not inline composition can be performed for the current input.
   bool can_compose_inline;
 };
 
 }  // namespace ui
 
 #endif  // UI_PLATFORM_WINDOW_TEXT_INPUT_STATE_H_