Position close buttons in bubbles based on a layout delegate constant.

chrome/browser/ui/views/harmony/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/harmony_layout_delegate.h"
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 
 static base::LazyInstance<HarmonyLayoutDelegate> harmony_layout_delegate_ =
     LAZY_INSTANCE_INITIALIZER;
 
 // static
 HarmonyLayoutDelegate* HarmonyLayoutDelegate::Get() {
   return harmony_layout_delegate_.Pointer();
 }
 
 int HarmonyLayoutDelegate::GetMetric(Metric metric) const {
   switch (metric) {
     case Metric::DIALOG_BUTTON_MARGIN:
       return kHarmonyLayoutUnit;
+    case Metric::DIALOG_CLOSE_BUTTON_MARGIN:
+      // TODO(pkasting): The "- 4" here is a hack that matches the extra padding
+      // in vector_icon_button.cc and should be removed when that padding is.
+      return (kHarmonyLayoutUnit / 2) - 4;
     case Metric::PANEL_CONTENT_MARGIN:
       return kHarmonyLayoutUnit;
     case Metric::RELATED_BUTTON_HORIZONTAL_SPACING:
       return kHarmonyLayoutUnit / 2;
     case Metric::RELATED_CONTROL_HORIZONTAL_SPACING:
       return kHarmonyLayoutUnit;
     case Metric::RELATED_CONTROL_VERTICAL_SPACING:
       return kHarmonyLayoutUnit / 2;
     case Metric::RELATED_LABEL_HORIZONTAL_SPACING:
       return kHarmonyLayoutUnit;
@@ skipping 26 matching lines @@
     case DialogWidth::SMALL:
       return 320;
     case DialogWidth::MEDIUM:
       return 448;
     case DialogWidth::LARGE:
       return 512;
   }
   NOTREACHED();
   return 0;
 }