[draft] flush visual state prototype

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 632cc673edef71d3222dfd971b9bb4b93aa8af40..0ddcafe5793e996c2ed35d7ad077c67485385823 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -916,6 +916,8 @@ bool RenderFrameImpl::OnMessageReceived(const IPC::Message& msg) {
                         OnJavaScriptExecuteRequest)
     IPC_MESSAGE_HANDLER(FrameMsg_JavaScriptExecuteRequestForTests,
                         OnJavaScriptExecuteRequestForTests)
+    IPC_MESSAGE_HANDLER(FrameMsg_FlushVisualStateRequest,
+                        OnFlushVisualStateRequest)
     IPC_MESSAGE_HANDLER(FrameMsg_SetEditableSelectionOffsets,
                         OnSetEditableSelectionOffsets)
     IPC_MESSAGE_HANDLER(FrameMsg_SetupTransitionView, OnSetupTransitionView)
@@ -1379,6 +1381,12 @@ void RenderFrameImpl::HandleJavascriptExecutionResult(
   }
 }
 
+void RenderFrameImpl::OnFlushVisualStateRequest(int id) {
+  GetRenderWidget()->QueueMessage(
+      new FrameHostMsg_FlushVisualStateResponse(routing_id_, id),
+      MESSAGE_DELIVERY_POLICY_WITH_VISUAL_STATE);
+}
+
 void RenderFrameImpl::OnSetEditableSelectionOffsets(int start, int end) {
   base::AutoReset<bool> handling_select_range(&handling_select_range_, true);
   if (!GetRenderWidget()->ShouldHandleImeEvent())