Show extension icons next to their top-level context menu items....

chrome/common/extensions/extension_resource.h

 // Copyright (c) 2010 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 CHROME_COMMON_EXTENSIONS_EXTENSION_RESOURCE_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_RESOURCE_H_
 
+#include <string>
+
 #include "base/file_path.h"
 #include "base/platform_thread.h"
 
 // Represents a resource inside an extension. For example, an image, or a
 // JavaScript file. This is more complicated than just a simple FilePath
 // because extension resources can come from multiple physical file locations
 // depending on locale.
 class ExtensionResource {
  public:
   ExtensionResource();
 
-  ExtensionResource(const FilePath& extension_root,
+  ExtensionResource(const std::string& extension_id,
+                    const FilePath& extension_root,
                     const FilePath& relative_path);
 
   // Returns actual path to the resource (default or locale specific). In the
   // browser process, this will DCHECK if not called on the file thread. To
   // easily load extension images on the UI thread, see ImageLoadingTracker.
   const FilePath& GetFilePath() const;
 
   // Gets the physical file path for the extension resource, taking into account
   // localization. In the browser process, this will DCHECK if not called on the
   // file thread. To easily load extension images on the UI thread, see
@@ skipping 14 matching lines @@
   static void set_file_thread_id(PlatformThreadId thread_id) {
     file_thread_id_ = thread_id;
     check_for_file_thread_ = true;
   }
 
   // Checks whether we are running on the file thread and DCHECKs if not. Relies
   // on set_file_thread_id being called first, otherwise, it will not DCHECK.
   static void CheckFileAccessFromFileThread();
 
   // Getters
+  const std::string& extension_id() const { return extension_id_; }
   const FilePath& extension_root() const { return extension_root_; }
   const FilePath& relative_path() const { return relative_path_; }
 
+  bool empty() { return extension_root().empty(); }
+
   // Unit test helpers.
   FilePath::StringType NormalizeSeperators(FilePath::StringType path) const;
   bool ComparePathWithDefault(const FilePath& path) const;
 
  private:
+  // The id of the extension that this resource is associated with.
+  std::string extension_id_;
+
   // Extension root.
   FilePath extension_root_;
 
   // Relative path to resource.
   FilePath relative_path_;
 
   // Full path to extension resource. Starts empty.
   mutable FilePath full_resource_path_;
 
   // The thread id for the file thread. If set, GetFilePath() and related
   // methods will DCHECK that they are on this thread when called.
   static PlatformThreadId file_thread_id_;
 
   // Whether to check for file thread. See |file_thread_id_|. If set,
   // GetFilePath() and related methods will DCHECK that they are on this thread
   // when called.
   static bool check_for_file_thread_;
 };
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_RESOURCE_H_