Make Interaction Media Features MQ dynamic on Linux.

ui/base/touch/touch_device_util.cc

+// Copyright 2017 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/touch/touch_device.h"
+
+namespace ui {
+
+namespace {
+
+int available_pointer_types_for_testing = POINTER_TYPE_NONE;
+int available_hover_types_for_testing = HOVER_TYPE_NONE;
+bool return_available_pointer_and_hover_types_for_testing = false;
+}
+
+void SetAvailablePointerAndHoverTypesForTesting(int available_pointer_types,
+                                                int available_hover_types) {
+  return_available_pointer_and_hover_types_for_testing = true;
+  available_pointer_types_for_testing = available_pointer_types;
+  available_hover_types_for_testing = available_hover_types;
+}
+
+std::pair<int, int> GetAvailablePointerAndHoverTypes() {
+  if (return_available_pointer_and_hover_types_for_testing)
+    return std::make_pair(available_pointer_types_for_testing,
+                          available_hover_types_for_testing);
+  return std::make_pair(GetAvailablePointerTypes(), GetAvailableHoverTypes());
+}
+
+}  // namespace ui