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 000e53227f216ded50ea6cc3df37b20461f9283b..2c133d7829498b9b941b45439e3e563f1f6ddefd 100644
--- a/content/browser/renderer_host/render_widget_host_view_win.cc
+++ b/content/browser/renderer_host/render_widget_host_view_win.cc
@@ -410,7 +410,8 @@ RenderWidgetHostViewWin::RenderWidgetHostViewWin(RenderWidgetHost* widget)
       pointer_down_context_(false),
       last_touch_location_(-1, -1),
       touch_events_enabled_(false),
-      gesture_recognizer_(ui::GestureRecognizer::Create(this)) {
+      gesture_recognizer_(ui::GestureRecognizer::Create(this)),
+      in_long_press_gesture_(false) {
   render_widget_host_->SetView(this);
   registrar_.Add(this,
                  NOTIFICATION_RENDERER_PROCESS_TERMINATED,
@@ -1746,6 +1747,12 @@ 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

[dcheng, 2013/05/24 01:10:37]

Nit: triggered.

[Hongbo Min, 2013/05/27 14:51:41]

Done.

+  // removed from screen.
+  if (message == WM_LBUTTONUP || message == WM_RBUTTONUP)

[dcheng, 2013/05/24 01:10:37]

Shouldn't this just be WM_RBUTTONUP? Or are there times when a long press
gesture is treated as a left mouse event?

[Hongbo Min, 2013/05/27 14:51:41]

Only WM_RBUTTONUP is taken into consideration. Done.

+    in_long_press_gesture_ = false;
+
   if (message == WM_MOUSELEAVE)
     ignore_mouse_movement_ = true;
 
@@ -2820,6 +2827,10 @@ bool RenderWidgetHostViewWin::ForwardGestureEventToRenderer(
         CreateFlingCancelEvent(gesture->time_stamp().InSecondsF()));
   }
   render_widget_host_->ForwardGestureEvent(web_gesture);
+
+  if (web_gesture.type == WebKit::WebGestureEvent::GestureLongPress)
+    in_long_press_gesture_ = true;
+
   return true;
 }