Add support for new scroll valuators coming from CMT

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,
+  ET_SCROLL,
 };
 
 // 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 15 matching lines @@
   TOUCH_STATUS_CONTINUE,     // The touch event is part of a previously
                              // started touch sequence.
   TOUCH_STATUS_END,          // The touch event ended the touch sequence.
   TOUCH_STATUS_CANCEL,       // The touch event was cancelled, but didn't
                              // terminate the touch sequence.
   TOUCH_STATUS_SYNTH_MOUSE   // The touch event was not processed, but a
                              // synthetic mouse event generated from the
                              // unused touch event was handled.
 };
 
+// Updates the list of devices for cached properties.
+UI_EXPORT void UpdateDeviceList();
+
 // Get the EventType from a native event.
 UI_EXPORT EventType EventTypeFromNative(const base::NativeEvent& native_event);
 
 // Get the EventFlags from a native event.
 UI_EXPORT int EventFlagsFromNative(const base::NativeEvent& native_event);
 
 // Get the location from a native event.
 UI_EXPORT gfx::Point EventLocationFromNative(
     const base::NativeEvent& native_event);
 
@@ skipping 21 matching lines @@
 // Gets the radius along the X/Y axis from a native event. Default is 1.0.
 UI_EXPORT float GetTouchRadiusX(const base::NativeEvent& native_event);
 UI_EXPORT float GetTouchRadiusY(const base::NativeEvent& native_event);
 
 // Gets the angle of the major axis away from the X axis. Default is 0.0.
 UI_EXPORT float GetTouchAngle(const base::NativeEvent& native_event);
 
 // Gets the force from a native_event. Normalized to be [0, 1]. Default is 0.0.
 UI_EXPORT float GetTouchForce(const base::NativeEvent& native_event);
 
+// Returns whether this is a scroll event and optionally gets the amount to be
+// scrolled. |x_offset| and |y_offset| can be NULL.
+UI_EXPORT bool GetScrollOffsets(const base::NativeEvent& native_event,
+                                float* x_offset,
+                                float* y_offset);
+
 // Creates and returns no-op event.
 UI_EXPORT base::NativeEvent CreateNoopEvent();
 
 }  // namespace ui
 
 #endif  // UI_BASE_EVENTS_H_