Make commit for swap promises do not set can_cancel_commit.

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index b15f6b8b2780dc2e93a1f94464b15e470c701660..0da93de7441c0cc11b3bb79f07ee5686493dec59 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -523,6 +523,10 @@ int RenderWidgetCompositor::GetSourceFrameNumber() const {
   return layer_tree_host_->source_frame_number();
 }
 
+void RenderWidgetCompositor::SetNeedsUpdateLayers() {
+  layer_tree_host_->SetNeedsUpdateLayers();
+}
+
 void RenderWidgetCompositor::SetNeedsCommit() {
   layer_tree_host_->SetNeedsCommit();
 }