Pointer/hover media query support: platform-independent changes

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 "ui/base/ui_base_export.h"
 
 #if defined(OS_ANDROID)
 #include <jni.h>
 #endif
 
 
 namespace ui {
 
 // Returns true if a touch device is available.
 UI_BASE_EXPORT bool IsTouchDevicePresent();
 
 // Returns the maximum number of simultaneous touch contacts supported
 // by the device. In the case of devices with multiple digitizers (e.g.
 // multiple touchscreens), the value MUST be the maximum of the set of
 // maximum supported contacts by each individual digitizer.
 // For example, suppose a device has 3 touchscreens, which support 2, 5,
 // and 10 simultaneous touch contacts, respectively. This returns 10.
 // http://www.w3.org/TR/pointerevents/#widl-Navigator-maxTouchPoints
 UI_BASE_EXPORT int MaxTouchPoints();
 
+// Bit field values indicating what kind of pointer types are available. These
+// enums must match blink::WebSettings::PointerType enums, which is compile-time
+// asserted in content/public/common/web_preferences.cc .
+enum PointerType {
+  POINTER_TYPE_NONE = 1 << 0,
+  POINTER_TYPE_FIRST = POINTER_TYPE_NONE,
+  POINTER_TYPE_COARSE = 1 << 1,
+  POINTER_TYPE_FINE = 1 << 2,
+  POINTER_TYPE_LAST = POINTER_TYPE_FINE
+};
+
+// Bit field values indicating what kind of hover types are available. These
+// enums must match blink::WebSettings::HoverType enums, which is compile-time
+// asserted in content/public/common/web_preferences.cc .
+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
+};

[sadrul, 2014/11/11 18:40:50]

I was going to suggest using the WebSettings::PointerType enums in
WebPreferences, since these new enums aren't used anywhere in UI code. But looks
like there will be follow-up patches that uses these on all platforms? In that
case, LGTM

+
 #if defined(OS_ANDROID)
 bool RegisterTouchDeviceAndroid(JNIEnv* env);
 #endif
 
 }  // namespace ui
 
 #endif  // UI_BASE_TOUCH_TOUCH_DEVICE_H_