Set toolbar padding to something appropriate for Metro icons.

ui/base/scale.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/scale.h"
+
+#include "base/basictypes.h"
+
+#if defined(OS_WIN)
+#include "ui/base/win/dpi.h"
+#include "ui/base/win/metro.h"
+#include <Windows.h>
+#endif  // defined(OS_WIN)
+
+namespace {
+
+#if defined(OS_WIN)
+
+void GetScaleImplWin(bool* use_metro, bool* use_hidpi) {
+#if defined(ENABLE_METRO)
+  *use_metro = ui::IsInMetroMode();
+#endif  // defined(ENABLE_METRO)
+#if defined(ENABLE_HIDPI)
+  *use_hidpi = ui::GetDPIScale() > 1.5;
+#endif  // defined(ENABLE_HIDPI)
+}
+
+#endif  // defined(OS_WIN)
+
+}  // namespace
+
+namespace ui {
+
+const DisplayScale GetDisplayScale() {
+#if defined(USE_ASH)
+  return DS_ASH;
+#elif !defined(OS_WIN)
+  return DS_DESKTOP_100;
+#else  // On Windows.
+  bool use_metro = false;
+  bool use_hidpi = false;
+  GetScaleImplWin(&use_metro, &use_hidpi);
+  if (use_metro) {
+    // TODO(joi): Other Metro scales.
+    return DS_METRO_100;
+  } else if (use_hidpi) {
+    return DS_DESKTOP_200;
+  } else {
+    return DS_DESKTOP_100;
+  }
+#endif  // On Windows.
+}
+
+}  // namespace ui