Initial views touchui GestureRecognizer support

ui/base/events.h

Index: ui/base/events.h
diff --git a/ui/base/events.h b/ui/base/events.h
index 1e834797eefe41d9f977569c4d491e1ea680270f..f403213358f68fcf0b07c059267f59a56b489338 100644
--- a/ui/base/events.h
+++ b/ui/base/events.h
@@ -35,6 +35,14 @@ enum EventType {
   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
@@ -70,6 +78,16 @@ enum TouchStatus {
                              // unused touch event was handled.
 };
 
+enum GestureStatus {
+  GESTURE_STATUS_UNKNOWN = 0,  // Unknown Gesture status. This is used to
+                               // indicate that the Gesture event was not
+                               // handled.
+  GESTURE_STATUS_CONSUMED,     // The Gesture event got consumed.
+  GESTURE_STATUS_SYNTH_MOUSE   // The Gesture event was not processed, but a
+                               // synthetic mouse event generated from the
+                               // unused Gesture event was handled.
+};
+
 // Get the EventType from a native event.
 UI_EXPORT EventType EventTypeFromNative(const base::NativeEvent& native_event);