Prevent duplicate content script injection defined in manifest.json (reland)

extensions/renderer/script_injection.h

 // Copyright 2014 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_SCRIPT_INJECTION_H_
 #define EXTENSIONS_RENDERER_SCRIPT_INJECTION_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 80 matching lines @@
   class FrameWatcher;
 
   // Sends a message to the browser to request permission to inject.
   void RequestPermissionFromBrowser();
 
   // Injects the script. Returns INJECTION_FINISHED if injection has finished,
   // otherwise INJECTION_BLOCKED.
   InjectionResult Inject(ScriptsRunInfo* scripts_run_info);
 
   // Inject any JS scripts into the frame for the injection.
-  void InjectJs();
+  void InjectJs(std::set<std::string>* executing_scripts,
+                size_t* num_injected_js_scripts);
 
   // Called when JS injection for the given frame has been completed.
   void OnJsInjectionCompleted(
       const blink::WebVector<v8::Local<v8::Value> >& results);
 
   // Inject any CSS source into the frame for the injection.
-  void InjectCss();
+  void InjectCss(std::set<std::string>* injected_stylesheets,
+                 size_t* num_injected_stylesheets);
 
   // Notify that we will not inject, and mark it as acknowledged.
   void NotifyWillNotInject(ScriptInjector::InjectFailureReason reason);
 
   // The injector for this injection.
   std::unique_ptr<ScriptInjector> injector_;
 
   // The RenderFrame into which this should inject the script.
   content::RenderFrame* render_frame_;
 
@@ skipping 27 matching lines @@
   std::unique_ptr<FrameWatcher> frame_watcher_;
 
   base::WeakPtrFactory<ScriptInjection> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ScriptInjection);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_SCRIPT_INJECTION_H_