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

ui/views/controls/tree/tree_view.cc

 // 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.
 
 #include "ui/views/controls/tree/tree_view.h"
 
 #include <algorithm>
 
 #include "base/i18n/rtl.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 1017 matching lines @@
     if (!internal_node->loaded_children())
       LoadChildren(internal_node);
     internal_node->set_is_expanded(true);
     return_value = true;
   }
   return return_value;
 }
 
 PrefixSelector* TreeView::GetPrefixSelector() {
   if (!selector_)
-    selector_.reset(new PrefixSelector(this));
+    selector_.reset(new PrefixSelector(this, this));
   return selector_.get();
 }
 
 bool TreeView::IsPointInExpandControl(InternalNode* node,
                                       const gfx::Point& point) {
   if (!model_->GetChildCount(node->model_node()))
     return false;
 
   int depth = -1;
   int row = GetRowForInternalNode(node, &depth);
@@ skipping 40 matching lines @@
   if (!is_expanded_)
     return max_width;
   for (int i = 0; i < child_count(); ++i) {
     max_width = std::max(max_width,
                          GetChild(i)->GetMaxWidth(indent, depth + 1));
   }
   return max_width;
 }
 
 }  // namespace views