Drag-and-drop: updateDragCursor

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index aa54face8ed21d62c431223d4392dcfffc7d96a4..458a1f4a8b8e9532a5ed4744d8a629732876d0fa 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -100,6 +100,7 @@
 using base::Time;
 using base::TimeDelta;
 using base::TimeTicks;
+using blink::WebDragOperation;
 using blink::WebDragOperationsMask;
 using blink::WebGestureEvent;
 using blink::WebInputEvent;
@@ -545,6 +546,7 @@ bool RenderWidgetHostImpl::OnMessageReceived(const IPC::Message &msg) {
                         OnForwardCompositorProto)
     IPC_MESSAGE_HANDLER(ViewHostMsg_SetNeedsBeginFrames, OnSetNeedsBeginFrames)
     IPC_MESSAGE_HANDLER(DragHostMsg_StartDragging, OnStartDragging)
+    IPC_MESSAGE_HANDLER(DragHostMsg_UpdateDragCursor, OnUpdateDragCursor)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -1514,6 +1516,15 @@ void RenderWidgetHostImpl::OnStartDragging(
                       bitmap_offset_in_dip, event_info);
 }
 
+void RenderWidgetHostImpl::OnUpdateDragCursor(WebDragOperation current_op) {
+  if (delegate_ && delegate_->OnUpdateDragCursor())
+    return;
+
+  RenderViewHostDelegateView* view = delegate_->GetDelegateView();
+  if (view)
+    view->UpdateDragCursor(current_op);

[kenrb, 2016/11/16 16:22:15]

I have a question about this. Could this be racy if you are getting
DragHostMsg_UpdateDragCursor across different frames, and the renderers take
different amounts of time to get around to sending it?

+}
+
 void RenderWidgetHostImpl::RendererExited(base::TerminationStatus status,
                                           int exit_code) {
   if (!renderer_initialized_)