Optimization: avoid making 4 JNI calls to get touch device attributes.

ui/base/touch/touch_device.h

 // 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.
 
 #ifndef UI_BASE_TOUCH_TOUCH_DEVICE_H_
 #define UI_BASE_TOUCH_TOUCH_DEVICE_H_
 
+#include <tuple>
+
 #include "build/build_config.h"
 #include "ui/base/ui_base_export.h"
 
 #if defined(OS_ANDROID)
 #include <jni.h>
 #endif
 
 // TODO(mustaq@chromium.org): This covers more than just touches. Rename to
 // input_device? crbug.com/438794
 
@@ skipping 35 matching lines @@
 // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.ui.base
 // GENERATED_JAVA_PREFIX_TO_STRIP: HOVER_TYPE_
 enum HoverType {
   HOVER_TYPE_NONE = 1 << 0,
   HOVER_TYPE_FIRST = HOVER_TYPE_NONE,
   HOVER_TYPE_ON_DEMAND = 1 << 1,
   HOVER_TYPE_HOVER = 1 << 2,
   HOVER_TYPE_LAST = HOVER_TYPE_HOVER
 };
 
-UI_BASE_EXPORT int GetAvailablePointerTypes();
-UI_BASE_EXPORT PointerType GetPrimaryPointerType();
-UI_BASE_EXPORT int GetAvailableHoverTypes();
-UI_BASE_EXPORT HoverType GetPrimaryHoverType();
+UI_BASE_EXPORT std::pair<int, int> GetAvailablePointerAndHoverTypes();
+UI_BASE_EXPORT PointerType GetPrimaryPointerType(int available_pointer_types);
+UI_BASE_EXPORT HoverType GetPrimaryHoverType(int available_hover_types);
 
 }  // namespace ui
 
 #endif  // UI_BASE_TOUCH_TOUCH_DEVICE_H_