Initial views touchui GestureRecognizer support

ui/base/events.h

 // Copyright (c) 2011 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_EVENTS_H_
 #define UI_BASE_EVENTS_H_
 #pragma once
 
 #include "base/event_types.h"
 #include "ui/base/keycodes/keyboard_codes.h"
@@ skipping 17 matching lines @@
   ET_KEY_PRESSED,
   ET_KEY_RELEASED,
   ET_MOUSEWHEEL,
   ET_TOUCH_RELEASED,
   ET_TOUCH_PRESSED,
   ET_TOUCH_MOVED,
   ET_TOUCH_STATIONARY,
   ET_TOUCH_CANCELLED,
   ET_DROP_TARGET_EVENT,
   ET_FOCUS_CHANGE,
+
+  // GestureEvent types.
+  ET_GESTURE_SCROLL_BEGIN,
+  ET_GESTURE_SCROLL_END,
+  ET_GESTURE_SCROLL_UPDATE,
+  ET_GESTURE_TAP,
+  ET_GESTURE_TAP_DOWN,
+  ET_GESTURE_DOUBLE_TAP,
 };
 
 // Event flags currently supported
 enum EventFlags {
   EF_CAPS_LOCK_DOWN     = 1 << 0,
   EF_SHIFT_DOWN         = 1 << 1,
   EF_CONTROL_DOWN       = 1 << 2,
   EF_ALT_DOWN           = 1 << 3,
   EF_LEFT_BUTTON_DOWN   = 1 << 4,
   EF_MIDDLE_BUTTON_DOWN = 1 << 5,
@@ skipping 38 matching lines @@
 
 // Returns true if the message is a mouse event.
 UI_EXPORT bool IsMouseEvent(const base::NativeEvent& native_event);
 
 // Get the mouse wheel offset from a native event.
 UI_EXPORT int GetMouseWheelOffset(const base::NativeEvent& native_event);
 
 }  // namespace ui
 
 #endif  // UI_BASE_EVENTS_H_