views: support vertical-drag-to-end on textfields

ui/views/style/platform_style.cc

 // 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.
 
 #include "ui/views/style/platform_style.h"
 
 #include "build/build_config.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/views/background.h"
 #include "ui/views/controls/button/label_button.h"
@@ skipping 26 matching lines @@
   scoped_ptr<LabelButtonBorder> border(new views::LabelButtonBorder());
   border->set_insets(views::LabelButtonAssetBorder::GetDefaultInsetsForStyle(
       Button::STYLE_TEXTBUTTON));
   return border;
 }
 
 // static
 scoped_ptr<ScrollBar> PlatformStyle::CreateScrollBar(bool is_horizontal) {
   return make_scoped_ptr(new NativeScrollBar(is_horizontal));
 }
+
+// static
+const bool PlatformStyle::kTextfieldDragVerticallyDragsToEnd = false;
 #endif
 
 #if !defined(OS_LINUX) || defined(OS_CHROMEOS)
 // static
 scoped_ptr<Border> PlatformStyle::CreateThemedLabelButtonBorder(
     LabelButton* button) {
   return button->CreateDefaultBorder();
 }
 #endif
 
 }  // namespace views