Map ET_POINTER_MOVED to ET_MOUSE_DRAGGED when a mouse button is down.

ui/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/events/event.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 
@@ skipping 454 matching lines @@
 MouseEvent::MouseEvent(const PointerEvent& pointer_event)
     : LocatedEvent(pointer_event),
       pointer_details_(pointer_event.pointer_details()) {
   DCHECK(pointer_event.IsMousePointerEvent());
   switch (pointer_event.type()) {
     case ET_POINTER_DOWN:
       SetType(ET_MOUSE_PRESSED);
       break;
 
     case ET_POINTER_MOVED:
-      SetType(ET_MOUSE_MOVED);
+      if (pointer_event.flags() &
+          (EF_LEFT_MOUSE_BUTTON | EF_MIDDLE_MOUSE_BUTTON |
+           EF_RIGHT_MOUSE_BUTTON)) {
+        SetType(ET_MOUSE_DRAGGED);
+      } else {
+        SetType(ET_MOUSE_MOVED);
+      }
       break;
 
     case ET_POINTER_ENTERED:
       SetType(ET_MOUSE_ENTERED);
       break;
 
     case ET_POINTER_EXITED:
       SetType(ET_MOUSE_EXITED);
       break;
 
@@ skipping 790 matching lines @@
                    gfx::PointF(x, y),
                    time_stamp,
                    flags | EF_FROM_TOUCH),
       details_(details) {
 }
 
 GestureEvent::~GestureEvent() {
 }
 
 }  // namespace ui