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

ui/base/touch/touch_device_android.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"
 
 #include "base/android/context_utils.h"
+#include "base/android/jni_array.h"
 #include "base/logging.h"
 #include "jni/TouchDevice_jni.h"
 
 using base::android::AttachCurrentThread;
 using base::android::GetApplicationContext;
 
 namespace ui {
 
 TouchScreensAvailability GetTouchScreensAvailability() {
   return TouchScreensAvailability::ENABLED;
 }
 
 int MaxTouchPoints() {
   return Java_TouchDevice_maxTouchPoints(AttachCurrentThread(),
                                          GetApplicationContext());
 }
 
-int GetAvailablePointerTypes() {
-  return Java_TouchDevice_availablePointerTypes(AttachCurrentThread(),
-                                                GetApplicationContext());
+std::pair<int, int> GetAvailablePointerAndHoverTypes() {
+  JNIEnv* env = AttachCurrentThread();
+  std::vector<int> pointer_and_hover_types;
+  base::android::JavaIntArrayToIntVector(
+      env, Java_TouchDevice_availablePointerAndHoverTypes(
+               env, GetApplicationContext())
+               .obj(),
+      &pointer_and_hover_types);
+  DCHECK_EQ(pointer_and_hover_types.size(), 2u);
+  return std::make_pair(pointer_and_hover_types[0], pointer_and_hover_types[1]);
 }
 
-PointerType GetPrimaryPointerType() {
-  int available_pointer_types = GetAvailablePointerTypes();
+PointerType GetPrimaryPointerType(int available_pointer_types) {
   if (available_pointer_types & POINTER_TYPE_COARSE)
     return POINTER_TYPE_COARSE;
   if (available_pointer_types & POINTER_TYPE_FINE)
     return POINTER_TYPE_FINE;
   DCHECK_EQ(available_pointer_types, POINTER_TYPE_NONE);
   return POINTER_TYPE_NONE;
 }
 
-int GetAvailableHoverTypes() {
-  return Java_TouchDevice_availableHoverTypes(AttachCurrentThread(),
-                                              GetApplicationContext());
-}
-
-HoverType GetPrimaryHoverType() {
-  int available_hover_types = GetAvailableHoverTypes();
+HoverType GetPrimaryHoverType(int available_hover_types) {
   if (available_hover_types & HOVER_TYPE_ON_DEMAND)
     return HOVER_TYPE_ON_DEMAND;
   if (available_hover_types & HOVER_TYPE_HOVER)
     return HOVER_TYPE_HOVER;
   DCHECK_EQ(available_hover_types, HOVER_TYPE_NONE);
   return HOVER_TYPE_NONE;
 }
 
 }  // namespace ui