Split content script injections into multiple tasks

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index a4f67e1e5346a49d35f450a620dac255b2b2bf00..f9750c1d44976b9b3a8c1544ae06e4f2af493c93 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -1407,6 +1407,15 @@ void ChromeContentRendererClient::RunScriptsAtDocumentEnd(
 #endif
 }
 
+void ChromeContentRendererClient::RunScriptsAtDocumentIdle(
+    content::RenderFrame* render_frame) {
+#if BUILDFLAG(ENABLE_EXTENSIONS)
+  ChromeExtensionsRendererClient::GetInstance()->RunScriptsAtDocumentIdle(
+      render_frame);
+  // |render_frame| might be dead by now.
+#endif
+}
+
 void ChromeContentRendererClient::
     DidInitializeServiceWorkerContextOnWorkerThread(
         v8::Local<v8::Context> context,