Enlarge size of touch target for several location bar buttons without affecting visual layout.

chrome/browser/ui/views/location_bar/touchable_location_bar_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 "chrome/browser/ui/views/location_bar/touchable_location_bar_view.h"
+
+#include "chrome/browser/ui/views/location_bar/location_bar_view.h"
+#include "ui/base/layout.h"
+#include "ui/views/border.h"
+
+// static
+void TouchableLocationBarView::Init(views::View* view) {
+  int horizontal_padding = GetBuiltInHorizontalPaddingImpl();
+  if (horizontal_padding != 0) {
+    view->set_border(views::Border::CreateEmptyBorder(
+        3, horizontal_padding, 3, horizontal_padding));
+  }
+}
+
+// static
+int TouchableLocationBarView::GetBuiltInHorizontalPaddingImpl() {
+  return ui::GetDisplayLayout() == ui::LAYOUT_TOUCH ?
+      LocationBarView::GetItemPadding() / 2 : 0;
+}