Add ink drop ripple (but no highlight) to comboboxes in harmony.

ui/views/controls/prefix_selector.h

 // Copyright 2013 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_VIEWS_CONTROLS_PREFIX_SELECTOR_H_
 #define UI_VIEWS_CONTROLS_PREFIX_SELECTOR_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "ui/base/ime/text_input_client.h"
 #include "ui/views/views_export.h"
 
 namespace views {
 
 class PrefixDelegate;
+class View;
 
 // PrefixSelector is used to change the selection in a view as the user
 // types characters.
 class VIEWS_EXPORT PrefixSelector : public ui::TextInputClient {
  public:
-  explicit PrefixSelector(PrefixDelegate* delegate);
+  PrefixSelector(PrefixDelegate* delegate, View* host_view);
   ~PrefixSelector() override;
 
   // Invoked from the view when it loses focus.
   void OnViewBlur();
 
   // ui::TextInputClient:
   void SetCompositionText(const ui::CompositionText& composition) override;
   void ConfirmCompositionText() override;
   void ClearCompositionText() override;
   void InsertText(const base::string16& text) override;
@@ skipping 28 matching lines @@
   void OnTextInput(const base::string16& text);
 
   // Returns true if the text of the node at |row| starts with |lower_text|.
   bool TextAtRowMatchesText(int row, const base::string16& lower_text);
 
   // Clears |current_text_| and resets |time_of_last_key_|.
   void ClearText();
 
   PrefixDelegate* prefix_delegate_;
 
+  View* host_view_;
+
   // Time OnTextInput() was last invoked.
   base::TimeTicks time_of_last_key_;
 
   base::string16 current_text_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefixSelector);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_PREFIX_SELECTOR_H_