Split content script injections into multiple tasks

extensions/renderer/extension_frame_helper.h

 // 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.
 
 #ifndef EXTENSIONS_RENDERER_EXTENSION_FRAME_HELPER_H_
 #define EXTENSIONS_RENDERER_EXTENSION_FRAME_HELPER_H_
 
 #include <vector>
 
 #include "base/callback_forward.h"
@@ skipping 55 matching lines @@
   }
 
   // Called when the document element has been inserted in this frame. This
   // method may invoke untrusted JavaScript code that invalidate the frame and
   // this ExtensionFrameHelper.
   void RunScriptsAtDocumentStart();
 
   // Called after the DOMContentLoaded event has fired.
   void RunScriptsAtDocumentEnd();
 
+  // Called before the window.onload event is fired.
+  void RunScriptsAtDocumentIdle();
+
   // Schedule a callback, to be run at the next RunScriptsAtDocumentStart
   // notification. Only call this when you are certain that there will be such a
   // notification, e.g. from RenderFrameObserver::DidCreateDocumentElement.
   // Otherwise the callback is never invoked, or invoked for a document that you
   // were not expecting.
   void ScheduleAtDocumentStart(const base::Closure& callback);
 
   // Schedule a callback, to be run at the next RunScriptsAtDocumentEnd call.
   void ScheduleAtDocumentEnd(const base::Closure& callback);
 
+  // Schedule a callback, to be run at the next RunScriptsAtDocumentIdle call.
+  void ScheduleAtDocumentIdle(const base::Closure& callback);
+
  private:
   // RenderFrameObserver implementation.
   void DidCreateDocumentElement() override;
   void DidCreateNewDocument() override;
   void DidMatchCSS(
       const blink::WebVector<blink::WebString>& newly_matching_selectors,
       const blink::WebVector<blink::WebString>& stopped_matching_selectors)
           override;
   void DidStartProvisionalLoad(blink::WebDataSource* data_source) override;
   void DidCreateScriptContext(v8::Local<v8::Context>,
@@ skipping 39 matching lines @@
 
   // Whether or not the current document element has been created.
   bool did_create_current_document_element_;
 
   // Callbacks to be run at the next RunScriptsAtDocumentStart notification.
   std::vector<base::Closure> document_element_created_callbacks_;
 
   // Callbacks to be run at the next RunScriptsAtDocumentEnd notification.
   std::vector<base::Closure> document_load_finished_callbacks_;
 
+  // Callbacks to be run at the next RunScriptsAtDocumentIdle notification.
+  std::vector<base::Closure> document_idle_callbacks_;
+
   bool delayed_main_world_script_initialization_ = false;
 
   base::WeakPtrFactory<ExtensionFrameHelper> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionFrameHelper);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_EXTENSION_FRAME_HELPER_H_