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

chrome/browser/ui/views/harmony/layout_delegate.cc

 // Copyright 2016 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/harmony/layout_delegate.h"
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "chrome/browser/ui/views/chrome_views_delegate.h"
 #include "chrome/browser/ui/views/harmony/chrome_typography.h"
@@ skipping 50 matching lines @@
     case Metric::SUBSECTION_HORIZONTAL_INDENT:
       return views::kCheckboxIndent;
     case Metric::UNRELATED_CONTROL_HORIZONTAL_SPACING:
       return views::kUnrelatedControlHorizontalSpacing;
     case Metric::UNRELATED_CONTROL_HORIZONTAL_SPACING_LARGE:
       return views::kUnrelatedControlLargeHorizontalSpacing;
     case Metric::UNRELATED_CONTROL_VERTICAL_SPACING:
       return views::kUnrelatedControlVerticalSpacing;
     case Metric::UNRELATED_CONTROL_VERTICAL_SPACING_LARGE:
       return views::kUnrelatedControlLargeVerticalSpacing;
+    case Metric::VECTOR_IMAGE_BUTTON_PADDING:
+      return views::kVectorButtonExtraTouchSize;
   }
   NOTREACHED();
   return 0;
 }
 
 views::GridLayout::Alignment LayoutDelegate::GetControlLabelGridAlignment()
     const {
   return views::GridLayout::TRAILING;
 }
 
@@ skipping 12 matching lines @@
 int LayoutDelegate::GetDialogPreferredWidth(DialogWidth width) const {
   return 0;
 }
 
 const views::TypographyProvider& LayoutDelegate::GetTypographyProvider() const {
   // This is not a data member because then HarmonyLayoutDelegate would inherit
   // it, even when it provides its own.
   CR_DEFINE_STATIC_LOCAL(LegacyTypographyProvider, legacy_provider, ());
   return legacy_provider;
 }