Set toolbar padding to something appropriate for Metro icons.

ui/base/layout.cc

+// Copyright (c) 2012 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/base/layout.h"
+
+#include "base/basictypes.h"
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include "base/win/metro.h"
+#include <Windows.h>
+#endif  // defined(OS_WIN)
+
+namespace ui {
+
+// Note that this function should be extended to select
+// LAYOUT_TOUCH when appropriate on more platforms than just
+// Windows.
+DisplayLayout GetDisplayLayout() {
+#if defined(USE_ASH)
+  return LAYOUT_ASH;
+#elif !defined(OS_WIN)
+  return LAYOUT_DESKTOP;
+#else  // On Windows.
+  bool use_touch = false;
+#if defined(ENABLE_METRO)
+  use_touch = base::win::GetMetroModule() != NULL;
+#endif  // defined(ENABLE_METRO)
+  if (use_touch) {
+    return LAYOUT_TOUCH;
+  } else {
+    return LAYOUT_DESKTOP;
+  }
+#endif  // On Windows.
+}
+
+}  // namespace ui