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

ui/base/touch/touch_device.cc

 // Copyright (c) 2013 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 {
 
 // Platforms supporting touch link in an alternate implementation of this
 // method.
 TouchScreensAvailability GetTouchScreensAvailability() {
   return TouchScreensAvailability::NONE;
 }
 
 int MaxTouchPoints() {
   return 0;
 }
 
+std::pair<int, int> GetAvailablePointerAndHoverTypes() {
+  return std::make_pair(GetAvailablePointerTypes(), GetAvailableHoverTypes());
+}
+
 int GetAvailablePointerTypes() {
   // Assume a non-touch-device with a mouse
   return POINTER_TYPE_FINE;
 }
 
+PointerType GetPrimaryPointerType(int available_pointer_types) {
+  // Assume a non-touch-device with a mouse
+  return POINTER_TYPE_FINE;
+}
+
 PointerType GetPrimaryPointerType() {
   // Assume a non-touch-device with a mouse
   return POINTER_TYPE_FINE;
 }
 
 int GetAvailableHoverTypes() {
   // Assume a non-touch-device with a mouse
   return HOVER_TYPE_HOVER;
 }
 
+HoverType GetPrimaryHoverType(int available_hover_types) {
+  // Assume a non-touch-device with a mouse
+  return HOVER_TYPE_HOVER;
+}
+
 HoverType GetPrimaryHoverType() {
   // Assume a non-touch-device with a mouse
   return HOVER_TYPE_HOVER;
 }

[sadrul, 2016/09/02 18:36:30]

I think you can remove the older versions from here too.

 
 }  // namespace ui