Loads local resources from current locale subtree if available, if not it fal...

chrome/browser/extensions/image_loading_tracker.h

 // Copyright (c) 2009 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_BROWSER_IMAGE_LOADING_TRACKER_H_
-#define CHROME_BROWSER_IMAGE_LOADING_TRACKER_H_
+#ifndef CHROME_BROWSER_EXTENSIONS_IMAGE_LOADING_TRACKER_H_
+#define CHROME_BROWSER_EXTENSIONS_IMAGE_LOADING_TRACKER_H_
 
 #include "base/ref_counted.h"
 
-class FilePath;
+class ExtensionResource;
 class SkBitmap;
 
 // The views need to load their icons asynchronously but might be deleted before
 // the images have loaded. This class stays alive while the request is in
 // progress (manages its own lifetime) and keeps track of whether the view still
 // cares about the icon loading.
+// Consider abstracting out a FilePathProvider (ExtensionResource) and moving
+// back to chrome/browser/ if other subsystems want to use it.
 class ImageLoadingTracker
   : public base::RefCountedThreadSafe<ImageLoadingTracker> {
  public:
   class Observer {
    public:
     // Will be called when the image with the given index has loaded.
     // The |image| is owned by the tracker, so the observer should make a copy
     // if they need to access it after this call.
     virtual void OnImageLoaded(SkBitmap* image, size_t index) = 0;
   };
 
   ImageLoadingTracker(Observer* observer, size_t image_count)
     : observer_(observer), image_count_(image_count), posted_count_(0) {
     AddRef();  // We hold on to a reference to ourself to make sure we don't
                // get deleted until we get a response from image loading (see
                // ImageLoadingDone).
   }
   ~ImageLoadingTracker() {}
 
   // If there are remaining images to be loaded, the observing object should
   // call this method on its destruction, so that the tracker will not attempt
   // to make any more callbacks to it.
   void StopTrackingImageLoad() {
     observer_ = NULL;
   }
 
-  // Specify path of image to load.  This method must be called a number of
+  // Specify image resource to load.  This method must be called a number of
   // times equal to the |image_count| arugment to the constructor.  Calling it
   // any more or less than that is an error.
-  void PostLoadImageTask(FilePath path);
+  void PostLoadImageTask(const ExtensionResource& resource);
 
  private:
   class LoadImageTask;
 
   // When an image has finished loaded and scaled on the file thread, it is
   // posted back to this method on the original thread.  This method then calls
   // the observer's OnImageLoaded and deletes the ImageLoadingTracker if it was
   // the last image in the list.
   // |image| may be null if the file failed to decode.
   void OnImageLoaded(SkBitmap* image, size_t index);
 
   // The view that is waiting for the image to load.
   Observer* observer_;
 
   // The number of images this ImageTracker should keep track of.  This is
   // decremented as each image finishes loading, and the tracker will delete
   // itself when it reaches zero.
   size_t image_count_;
 
   // The number of tasks that have been posted so far.
   size_t posted_count_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageLoadingTracker);
 };
 
-#endif  // CHROME_BROWSER_IMAGE_LOADING_TRACKER_H_
+#endif  // CHROME_BROWSER_EXTENSIONS_IMAGE_LOADING_TRACKER_H_