Enable touch-initiated drag-drop work on Windows

content/browser/renderer_host/render_widget_host_view_win.cc

Index: content/browser/renderer_host/render_widget_host_view_win.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_win.cc b/content/browser/renderer_host/render_widget_host_view_win.cc
index ea99f0a7a1ea63ba6044a3607a9eca7b592b6e2b..9ea6131a081f5058ab0a7f41c2798a794920a5b4 100644
--- a/content/browser/renderer_host/render_widget_host_view_win.cc
+++ b/content/browser/renderer_host/render_widget_host_view_win.cc
@@ -412,7 +412,8 @@ RenderWidgetHostViewWin::RenderWidgetHostViewWin(RenderWidgetHost* widget)
       last_touch_location_(-1, -1),
       touch_events_enabled_(false),
       ALLOW_THIS_IN_INITIALIZER_LIST(
-          gesture_recognizer_(ui::GestureRecognizer::Create(this))) {
+          gesture_recognizer_(ui::GestureRecognizer::Create(this))),
+      has_valid_long_press_gesture_(false) {
   render_widget_host_->SetView(this);
   registrar_.Add(this,
                  NOTIFICATION_RENDERER_PROCESS_TERMINATED,
@@ -1740,6 +1741,12 @@ LRESULT RenderWidgetHostViewWin::OnMouseEvent(UINT message, WPARAM wparam,
   TRACE_EVENT0("browser", "RenderWidgetHostViewWin::OnMouseEvent");
   handled = TRUE;
 
+  // Set the long press gesture is invalid once mouse up event is received.
+  // On Windows, a mouse up event gets triggerred once a touch point is
+  // removed from screen.
+  if (message == WM_LBUTTONUP || message == WM_RBUTTONUP)
+    has_valid_long_press_gesture_ = false;
+
   if (message == WM_MOUSELEAVE)
     ignore_mouse_movement_ = true;
 
@@ -2817,6 +2824,10 @@ bool RenderWidgetHostViewWin::ForwardGestureEventToRenderer(
         CreateFlingCancelEvent(gesture->time_stamp().InSecondsF()));
   }
   render_widget_host_->ForwardGestureEvent(web_gesture);
+
+  if (web_gesture.type == WebKit::WebGestureEvent::GestureLongPress)
+    has_valid_long_press_gesture_ = true;
+
   return true;
 }