Create a new action triggered when a BeginMainFrame is not expected before vsync

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index 8b0976ddfaa674473b8921f232d0eea4036e938f..96ceae2e70cb7bb1e31cae75b6186a2ce4930122 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -250,6 +250,10 @@ void LayerTreeHost::BeginMainFrameNotExpectedSoon() {
   client_->BeginMainFrameNotExpectedSoon();
 }
 
+void LayerTreeHost::DoShortIdleWork(const BeginFrameArgs& args) {
+  client_->DoShortIdleWork(args);
+}
+
 void LayerTreeHost::BeginMainFrame(const BeginFrameArgs& args) {
   client_->BeginMainFrame(args);
 }