Revert of Revert vector icon CLs.

ui/gfx/vector_icons/vector_icons.cc.template

+// 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.
+
+// vector_icons.cc.template is used to generate vector_icons.cc. Edit the former
+// rather than the latter.
+
+#include "ui/gfx/vector_icons.h"
+
+#include "base/logging.h"
+#include "ui/gfx/vector_icons_public.h"
+
+#define ICON_TEMPLATE(icon_name, ...) \
+    case VectorIconId::icon_name: {\
+      static PathElement path[] = {__VA_ARGS__};\
+      return path;\
+    }
+
+namespace gfx {
+
+const PathElement* GetPathForVectorIcon(VectorIconId id) {
+  switch (id) {
+    case VectorIconId::VECTOR_ICON_NONE:
+      NOTREACHED();
+      return nullptr;
+
+TEMPLATE_PLACEHOLDER
+  }
+
+  NOTREACHED();
+  return nullptr;
+}
+
+}  // namespace gfx