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 "base/lazy_instance.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 376 matching lines @@
                                    VectorIconId::VECTOR_ICON_NONE);
 }
 
 ImageSkia CreateVectorIconWithBadge(VectorIconId id,
                                     size_t dip_size,
                                     SkColor color,
                                     VectorIconId badge_id) {
   return g_icon_cache.Get().GetOrCreateIcon(id, dip_size, color, badge_id);
 }
 
+ImageSkia CreatePrimaryVectorIcon(VectorIconId id, SkColor color) {
+  const PathElement* one_x_path = GetPathForVectorIconAt1xScale(id);
+#ifndef NDEBUG

[sky, 2015/10/13 20:15:06]

nit: if !defined(NDEBUG)

+  const PathElement* general_path = GetPathForVectorIcon(id);
+  DCHECK_NE(one_x_path, general_path);
+#endif
+  DCHECK_EQ(one_x_path[0].type, CANVAS_DIMENSIONS);
+
+  const size_t size = one_x_path[1].arg;
+  return CreateVectorIcon(id, size, color);
+}
+
 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