Refactoring: de-couple Extensions from "script injection System" [render side] : 1

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 "base/basictypes.h"
 #include "base/macros.h"
+#include "extensions/common/host_id.h"
 #include "extensions/common/user_script.h"
 #include "extensions/renderer/script_injector.h"
 
 namespace blink {
 class WebLocalFrame;
 }
 
 namespace extensions {
-class Extension;
 struct ScriptsRunInfo;
 
 // A script wrapper which is aware of whether or not it is allowed to execute,
 // and contains the implementation to do so.
 class ScriptInjection {
  public:
-  // Return the id of the extension associated with the given world.
-  static std::string GetExtensionIdForIsolatedWorld(int world_id);
+  // Return the id of the host associated with the given world.
+  static HostID GetHostIdForIsolatedWorld(int world_id);
 
-  // Remove the isolated world associated with the given extension.
-  static void RemoveIsolatedWorld(const std::string& extension_id);
+  // Remove the isolated world associated with the given host.
+  static void RemoveIsolatedWorld(const HostID& host_id);
 
   ScriptInjection(scoped_ptr<ScriptInjector> injector,
                   blink::WebLocalFrame* web_frame,
-                  const std::string& extension_id,
+                  const HostID& host_id,
+                  int instance_id,
                   UserScript::RunLocation run_location,
                   int tab_id);
   ~ScriptInjection();
 
   // Try to inject the script at the |current_location|. This returns true if
   // the script has either injected or will never inject (i.e., if the object
   // is done), and false if injection is delayed (either for permission purposes
   // or because |current_location| is not the designated |run_location_|).
-  // NOTE: |extension| may be NULL, if the extension is removed!
+  // NOTE: |host| may be NULL, if the host is removed!
   bool TryToInject(UserScript::RunLocation current_location,
-                   const Extension* extension,
+                   const Host* host,
                    ScriptsRunInfo* scripts_run_info);
 
   // Called when permission for the given injection has been granted.
   // Returns true if the injection ran.
-  bool OnPermissionGranted(const Extension* extension,
+  bool OnPermissionGranted(const Host* host,
                            ScriptsRunInfo* scripts_run_info);
 
   // Accessors.
   blink::WebLocalFrame* web_frame() const { return web_frame_; }
-  const std::string& extension_id() const { return extension_id_; }
+  const HostID& host_id() const { return host_id_; }
   int64 request_id() const { return request_id_; }
 
  private:
   // Send a message to the browser requesting permission to execute.
   void RequestPermission();
 
   // Injects the script, optionally populating |scripts_run_info|.
-  void Inject(const Extension* extension, ScriptsRunInfo* scripts_run_info);
+  void Inject(const Host* host, ScriptsRunInfo* scripts_run_info);
 
   // Inject any JS scripts into the |frame|, optionally populating
   // |execution_results|.
-  void InjectJs(const Extension* extension,
+  void InjectJs(const Host* host,
                 blink::WebLocalFrame* frame,
                 base::ListValue* execution_results);
 
   // Inject any CSS source into the |frame|.
   void InjectCss(blink::WebLocalFrame* frame);
 
   // Notify that we will not inject, and mark it as acknowledged.
   void NotifyWillNotInject(ScriptInjector::InjectFailureReason reason);
 
   // The injector for this injection.
   scoped_ptr<ScriptInjector> injector_;
 
   // The (main) WebFrame into which this should inject the script.
   blink::WebLocalFrame* web_frame_;
 
-  // The id of the associated extension.
-  std::string extension_id_;
+  // The id of the associated host.
+  HostID host_id_;
+
+  // The id of the instance on which the host will inject the script.
+  // If the instance is a regular tab, the |instance_id| is 0; if the instance
+  // is a <webview>, the |instance_id| is a unique positive number.
+  int instance_id_;
 
   // The location in the document load at which we inject the script.
   UserScript::RunLocation run_location_;
 
   // The tab id associated with the frame.
   int tab_id_;
 
   // This injection's request id. This will be -1 unless the injection is
   // currently waiting on permission.
   int64 request_id_;
 
   // Whether or not the injection is complete, either via injecting the script
   // or because it will never complete.
   bool complete_;
 
   DISALLOW_COPY_AND_ASSIGN(ScriptInjection);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_SCRIPT_INJECTION_H_