Use an InsetMetric instead of a constant for vector button padding.

ui/views/views_delegate.cc

 // Copyright (c) 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.
 
 #include "ui/views/views_delegate.h"
 
 #include "base/command_line.h"
 #include "build/build_config.h"
 #include "ui/views/layout/layout_constants.h"
 #include "ui/views/views_touch_selection_controller_factory.h"
@@ skipping 118 matching lines @@
 gfx::Insets ViewsDelegate::GetInsetsMetric(InsetsMetric metric) const {
   switch (metric) {
     case InsetsMetric::DIALOG_BUTTON:
       return gfx::Insets(0, kButtonHEdgeMarginNew, kButtonVEdgeMarginNew,
                          kButtonHEdgeMarginNew);
     case InsetsMetric::DIALOG_FRAME_VIEW:
       return gfx::Insets(kPanelVertMargin, kButtonHEdgeMarginNew, 0,
                          kButtonHEdgeMarginNew);
     case InsetsMetric::BUBBLE_DIALOG:
       return gfx::Insets(kPanelVertMargin, kPanelHorizMargin);
+    case InsetsMetric::VECTOR_IMAGE_BUTTON_PADDING:
+      return gfx::Insets(kVectorButtonExtraTouchSize);
   }
   NOTREACHED();
   return gfx::Insets();
 }
 
 int ViewsDelegate::GetDistanceMetric(DistanceMetric metric) const {
   switch (metric) {
     case DistanceMetric::CLOSE_BUTTON_MARGIN:
       return kCloseButtonMargin;
     case DistanceMetric::RELATED_BUTTON_HORIZONTAL:
@@ skipping 17 matching lines @@
   views_delegate = this;
 
   ui::TouchEditingControllerFactory::SetInstance(views_tsc_factory_.get());
 
 #if defined(USE_AURA)
   touch_selection_menu_runner_.reset(new TouchSelectionMenuRunnerViews());
 #endif
 }
 
 }  // namespace views