For some vector icons, get the size from the vector definition.

ui/gfx/paint_vector_icon.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/gfx/paint_vector_icon.h"
 
 #include <map>
 #include <tuple>
 
 #include "base/i18n/rtl.h"
@@ skipping 378 matching lines @@
                      VectorIconId id,
                      size_t dip_size,
                      SkColor color) {
   DCHECK(VectorIconId::VECTOR_ICON_NONE != id);
   const PathElement* path = canvas->image_scale() == 1.f
                                 ? GetPathForVectorIconAt1xScale(id)
                                 : GetPathForVectorIcon(id);
   PaintPath(canvas, path, dip_size, color);
 }
 
+ImageSkia CreateVectorIcon(VectorIconId id, SkColor color) {
+  const PathElement* one_x_path = GetPathForVectorIconAt1xScale(id);
+  size_t size = one_x_path[0].type == CANVAS_DIMENSIONS ? one_x_path[1].arg
+                                                        : kReferenceSizeDip;
+  return CreateVectorIcon(id, size, color);
+}
+
 ImageSkia CreateVectorIcon(VectorIconId id, size_t dip_size, SkColor color) {
   return CreateVectorIconWithBadge(id, dip_size, color,
                                    VectorIconId::VECTOR_ICON_NONE);
 }
 
 ImageSkia CreateVectorIconWithBadge(VectorIconId id,
                                     size_t dip_size,
                                     SkColor color,
                                     VectorIconId badge_id) {
   return (id == VectorIconId::VECTOR_ICON_NONE)
              ? gfx::ImageSkia()
              : g_icon_cache.Get().GetOrCreateIcon(id, dip_size, color,
                                                   badge_id);
 }
 
 ImageSkia CreateVectorIconFromSource(const std::string& source,
                                      size_t dip_size,
                                      SkColor color) {
   return ImageSkia(
       new VectorIconSource(source, dip_size, color),
       gfx::Size(static_cast<int>(dip_size), static_cast<int>(dip_size)));
 }
 
 }  // namespace gfx