Refactoring: de-couple Extensions from "script injection System" [render side]:4

extensions/common/extension_set.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_COMMON_EXTENSION_SET_H_
 #define EXTENSIONS_COMMON_EXTENSION_SET_H_
 
 #include <iterator>
 #include <map>
 #include <string>
 
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "extensions/common/extension.h"
 #include "url/gurl.h"
 
+struct HostID;
+
 namespace extensions {
 
 // The one true extension container. Extensions are identified by their id.
 // Only one extension can be in the set with a given ID.
 class ExtensionSet {
  public:
   typedef std::pair<base::FilePath, std::string> ExtensionPathAndDefaultLocale;
   typedef std::map<std::string, scoped_refptr<const Extension> > ExtensionMap;
   typedef base::Callback<void(const ExtensionIdSet&)>
       ModificationCallback;
@@ skipping 89 matching lines @@
   // Returns true if |new_url| is in the extent of the same extension as
   // |old_url|.  Also returns true if neither URL is in an app.
   bool InSameExtent(const GURL& old_url, const GURL& new_url) const;
 
   // Look up an Extension object by id.
   const Extension* GetByID(const std::string& id) const;
 
   // Gets the IDs of all extensions in the set.
   ExtensionIdSet GetIDs() const;
 
+  // Gets the HostIDs of all extensions in the set.
+  std::set<HostID> GetHostIDs() const;

[Devlin, 2015/03/09 16:00:04]

This doesn't really belong here.  An ExtensionSet is an extensions concept, but
HostId is a script injection concept.

[Xi Han, 2015/03/09 19:12:36]

Moved to UserScriptSetManager.

+
   // Returns true if |info| should get extension api bindings and be permitted
   // to make api calls. Note that this is independent of what extension
   // permissions the given extension has been granted.
   bool ExtensionBindingsAllowed(const GURL& url) const;
 
   void set_modification_callback(
       const ModificationCallback& modification_callback) {
     modification_callback_ = modification_callback;
   }
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ExtensionSetTest, ExtensionSet);
 
   ExtensionMap extensions_;
 
   // If non-null, called with the extension ids in this set after a modification
   // occurred. This is not called on Clear() which is typically used when
   // discarding the set (e.g., on shutdown) and we do not want to track that as
   // a real modification.
   ModificationCallback modification_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionSet);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_EXTENSION_SET_H_