Touch-initiated drag-out to download file but fails.

ui/base/dragdrop/drag_source_win.cc

 // 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.
 
 #include "ui/base/dragdrop/drag_source_win.h"
 
 namespace ui {
 
 DragSourceWin::DragSourceWin() : cancel_drag_(false) {
 }
 
 HRESULT DragSourceWin::QueryContinueDrag(BOOL escape_pressed, DWORD key_state) {
   if (cancel_drag_)
     return DRAGDROP_S_CANCEL;
 
   if (escape_pressed) {
     OnDragSourceCancel();
     return DRAGDROP_S_CANCEL;
   }
 
-  if (!(key_state & MK_LBUTTON)) {
+  if (ShouldDropDragSource(escape_pressed, key_state)) {
     OnDragSourceDrop();
     return DRAGDROP_S_DROP;
   }
 
   OnDragSourceMove();
   return S_OK;
 }
 
 HRESULT DragSourceWin::GiveFeedback(DWORD effect) {
   return DRAGDROP_S_USEDEFAULTCURSORS;
@@ skipping 13 matching lines @@
 ULONG DragSourceWin::AddRef() {
   base::RefCountedThreadSafe<DragSourceWin>::AddRef();
   return 0;
 }
 
 ULONG DragSourceWin::Release() {
   base::RefCountedThreadSafe<DragSourceWin>::Release();
   return 0;
 }
 
+bool DragSourceWin::ShouldDropDragSource(
+    BOOL escape_pressed,DWORD key_state) {
+  return !(key_state & MK_LBUTTON);
+}
+
 }  // namespace ui