Browser side changes for software compositing

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 33ae4ecb55bd4abcf54654e83395cdefa9977d7c..dc0fbc6d152324306f343f75bea09bd9ae8c3af6 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -1619,6 +1619,8 @@ bool RenderWidgetHostImpl::OnSwapCompositorFrame(
       ack.gl_frame_data->sync_point = 0;
     } else if (frame->delegated_frame_data) {
       ack.resources.swap(frame->delegated_frame_data->resource_list);
+    } else if (frame->software_frame_data) {
+      ack.last_content_dib = frame->software_frame_data->content_dib;
     }
     SendSwapCompositorFrameAck(routing_id_, process_->GetID(), ack);
   }