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

ui/views/controls/tree/tree_view.h

 // Copyright (c) 2012 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_TREE_TREE_VIEW_VIEWS_H_
 #define UI_VIEWS_CONTROLS_TREE_TREE_VIEW_VIEWS_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 17 matching lines @@
 class TreeViewController;
 class PrefixSelector;
 
 // TreeView displays hierarchical data as returned from a TreeModel. The user
 // can expand, collapse and edit the items. A Controller may be attached to
 // receive notification of selection changes and restrict editing.
 //
 // Note on implementation. This implementation doesn't scale well. In particular
 // it does not store any row information, but instead calculates it as
 // necessary. But it's more than adequate for current uses.
-class VIEWS_EXPORT TreeView : public ui::TreeModelObserver,
+class VIEWS_EXPORT TreeView : public View,
+                              public ui::TreeModelObserver,
                               public TextfieldController,
                               public FocusChangeListener,
                               public PrefixDelegate {
  public:
   // The tree view's class name.
   static const char kViewClassName[];
 
   TreeView();
   ~TreeView() override;
 
@@ skipping 355 matching lines @@
   int text_offset_;
 
   std::unique_ptr<PrefixSelector> selector_;
 
   DISALLOW_COPY_AND_ASSIGN(TreeView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_TREE_TREE_VIEW_VIEWS_H_