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

extensions/renderer/user_script_injector.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_USER_SCRIPT_INJECTOR_H_
 #define EXTENSIONS_RENDERER_USER_SCRIPT_INJECTOR_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/scoped_observer.h"
 #include "extensions/common/user_script.h"
 #include "extensions/renderer/script_injection.h"
 #include "extensions/renderer/user_script_set.h"
 
 class InjectionHost;
 
 namespace blink {
 class WebLocalFrame;
 }
 
 namespace extensions {
+struct ScriptsRunInfo;

[Devlin, 2016/09/08 17:47:32]

not needed

 
 // A ScriptInjector for UserScripts.
 class UserScriptInjector : public ScriptInjector,
                            public UserScriptSet::Observer {
  public:
   UserScriptInjector(const UserScript* user_script,
                      UserScriptSet* user_script_set,
                      bool is_declarative);
   ~UserScriptInjector() override;
 
  private:
   // UserScriptSet::Observer implementation.
   void OnUserScriptsUpdated(const std::set<HostID>& changed_hosts,
                             const UserScriptList& scripts) override;
 
   // ScriptInjector implementation.
   UserScript::InjectionType script_type() const override;
   bool ShouldExecuteInMainWorld() const override;
   bool IsUserGesture() const override;
   bool ExpectsResults() const override;
-  bool ShouldInjectJs(UserScript::RunLocation run_location) const override;
-  bool ShouldInjectCss(UserScript::RunLocation run_location) const override;
+  bool ShouldInjectJs(
+      UserScript::RunLocation run_location,
+      const std::set<std::string>& executing_scripts) const override;
+  bool ShouldInjectCss(
+      UserScript::RunLocation run_location,
+      const std::set<std::string>& injected_stylesheets) const override;
   PermissionsData::AccessType CanExecuteOnFrame(
       const InjectionHost* injection_host,
       blink::WebLocalFrame* web_frame,
       int tab_id) const override;
   std::vector<blink::WebScriptSource> GetJsSources(
-      UserScript::RunLocation run_location) const override;
+      UserScript::RunLocation run_location,
+      std::set<std::string>* executing_scripts,
+      size_t* num_injected_js_scripts) const override;
   std::vector<blink::WebString> GetCssSources(
-      UserScript::RunLocation run_location) const override;
-  void GetRunInfo(ScriptsRunInfo* scripts_run_info,
-                  UserScript::RunLocation run_location) const override;
+      UserScript::RunLocation run_location,
+      std::set<std::string>* injected_stylesheets,
+      size_t* num_injected_stylesheets) const override;
   void OnInjectionComplete(std::unique_ptr<base::Value> execution_result,
                            UserScript::RunLocation run_location,
                            content::RenderFrame* render_frame) override;
   void OnWillNotInject(InjectFailureReason reason,
                        content::RenderFrame* render_frame) override;
 
   // The associated user script. Owned by the UserScriptInjector that created
   // this object.
   const UserScript* script_;
 
@@ skipping 16 matching lines @@
 
   ScopedObserver<UserScriptSet, UserScriptSet::Observer>
       user_script_set_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(UserScriptInjector);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_USER_SCRIPT_INJECTOR_H_