Split content script injections into multiple tasks

extensions/renderer/extension_frame_helper.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/renderer/extension_frame_helper.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_util.h"
 #include "base/timer/elapsed_timer.h"
 #include "content/public/renderer/render_frame.h"
@@ skipping 153 matching lines @@
                                 &document_element_created_callbacks_);
   // |this| might be dead by now.
 }
 
 void ExtensionFrameHelper::RunScriptsAtDocumentEnd() {
   RunCallbacksWhileFrameIsValid(weak_ptr_factory_.GetWeakPtr(),
                                 &document_load_finished_callbacks_);
   // |this| might be dead by now.
 }
 
+void ExtensionFrameHelper::RunScriptsAtDocumentIdle() {
+  RunCallbacksWhileFrameIsValid(weak_ptr_factory_.GetWeakPtr(),
+                                &document_idle_callbacks_);
+  // |this| might be dead by now.
+}
+
 void ExtensionFrameHelper::ScheduleAtDocumentStart(
     const base::Closure& callback) {
   document_element_created_callbacks_.push_back(callback);
 }
 
 void ExtensionFrameHelper::ScheduleAtDocumentEnd(
     const base::Closure& callback) {
   document_load_finished_callbacks_.push_back(callback);
 }
 
+void ExtensionFrameHelper::ScheduleAtDocumentIdle(
+    const base::Closure& callback) {
+  document_idle_callbacks_.push_back(callback);
+}
+
 void ExtensionFrameHelper::DidMatchCSS(
     const blink::WebVector<blink::WebString>& newly_matching_selectors,
     const blink::WebVector<blink::WebString>& stopped_matching_selectors) {
   extension_dispatcher_->content_watcher()->DidMatchCSS(
       render_frame()->GetWebFrame(), newly_matching_selectors,
       stopped_matching_selectors);
 }
 
 void ExtensionFrameHelper::DidStartProvisionalLoad(
     blink::WebDataSource* data_source) {
@@ skipping 124 matching lines @@
     const base::ListValue& args) {
   extension_dispatcher_->InvokeModuleSystemMethod(
       render_frame(), extension_id, module_name, function_name, args);
 }
 
 void ExtensionFrameHelper::OnDestruct() {
   delete this;
 }
 
 }  // namespace extensions