Add ability for EventGenerator to generate Scroll events asynchronously

ui/base/events/event.cc

 // 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.
 
 #include "ui/base/events/event.h"
 
 #if defined(USE_X11)
 #include <X11/Xlib.h>
 #endif
 
@@ skipping 622 matching lines @@
     bool is_cancel;
     GetFlingData(native_event, &x_offset_, &y_offset_, &is_cancel);
   } else {
     NOTREACHED() << "Unexpected event type " << type()
         << " when constructing a ScrollEvent.";
   }
 }
 
 ScrollEvent::ScrollEvent(EventType type,
                          const gfx::Point& location,
+                         base::TimeDelta time_stamp,
                          int flags,
                          float x_offset,
-                         float y_offset)
+                         float y_offset,
+                         int finger_count)
     : MouseEvent(type, location, location, flags),
       x_offset_(x_offset),
-      y_offset_(y_offset) {
+      y_offset_(y_offset),
+      finger_count_(finger_count) {
+  set_time_stamp(time_stamp);
   CHECK(IsScrollEvent());
 }
 
 void ScrollEvent::Scale(const float factor) {
   x_offset_ *= factor;
   y_offset_ *= factor;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // GestureEvent
 
 GestureEvent::GestureEvent(EventType type,
                            int x,
                            int y,
                            int flags,
                            base::TimeDelta time_stamp,
                            const GestureEventDetails& details,
                            unsigned int touch_ids_bitfield)
-    : LocatedEvent(type, gfx::Point(x, y), gfx::Point(x, y), time_stamp, flags),
+    : LocatedEvent(type,
+                   gfx::Point(x, y),
+                   gfx::Point(x, y),
+                   time_stamp,
+                   flags | EF_FROM_TOUCH),
       details_(details),
       touch_ids_bitfield_(touch_ids_bitfield) {
 }
 
 GestureEvent::~GestureEvent() {
 }
 
 int GestureEvent::GetLowestTouchId() const {
   if (touch_ids_bitfield_ == 0)
     return -1;
   int i = -1;
   // Find the index of the least significant 1 bit
   while (!(1 << ++i & touch_ids_bitfield_));
   return i;
 }
 
 }  // namespace ui