Allow the password manager in the settings page to have hidpi favicons too

chrome/browser/ui/webui/favicon_source.h

 // Copyright (c) 2012 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_UI_WEBUI_FAVICON_SOURCE_H_
 #define CHROME_BROWSER_UI_WEBUI_FAVICON_SOURCE_H_
 
 #include <map>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/favicon/favicon_service.h"
 #include "chrome/common/cancelable_task_tracker.h"
 #include "content/public/browser/url_data_source.h"
 #include "ui/gfx/favicon_size.h"
 
 class Profile;
 
 // FaviconSource is the gateway between network-level chrome:
 // requests for favicons and the history backend that serves these.
+//
+// Format:
+//   chrome://favicon/size&scalefactor/urlmodifier/url
+// Some parameters are optional as described below. However, the order of the
+// parameters is not interchangeable.
+//
+// Parameter:
+//  'url'               Required
+//    Specifies the page URL of the requested favicon. If the 'urlmodifier'
+//    parameter is 'iconurl', the URL refers to the URL of the favicon image
+//    instead.
+//  'size&scalefactor'  Optional  size/aa@bx/
+//    Specifies the requested favicon's size in DIP (aa) and the requested
+//    favicon's scale factor. (b).
+//    The supported requested DIP sizes are: 16x16, 32x32 and 64x64.
+//    If the parameter is unspecified, the requested favicon's size defaults to
+//    16 and the requested scale factor defaults to 1x.
+//    Example: chrome://favicon/size/16@2x/http://www.google.com/
+//  'urlmodifier'      Optional
+//    Values: ['iconurl', 'origin']
+//    'iconurl': Specifies that the url parameter refers to the URL of
+//    the favicon image as opposed to the URL of the page that the favicon is
+//    on.
+//    Example: chrome://favicon/iconurl/http://www.google.com/favicon.ico
+//    'origin': Specifies that the URL should be converted to a form with
+//    an empty path and a valid scheme. The converted URL will be used to
+//    request the favicon from the favicon service.
+//    Examples:
+//      chrome://favicon/origin/http://example.com/a
+//      chrome://favicon/origin/example.com
+//        Both URLs request the favicon for http://example.com from the
+//        favicon service.
 class FaviconSource : public content::URLDataSource {
  public:
   // Defines the type of icon the FaviconSource will provide.
   enum IconType {
     FAVICON,
     // Any available icon in the priority of TOUCH_ICON_PRECOMPOSED, TOUCH_ICON,
     // FAVICON, and default favicon.
     ANY
   };
 
@@ skipping 41 matching lines @@
     SIZE_32,
     SIZE_64,
     NUM_SIZES
   };
 
   // Called when favicon data is available from the history backend.
   void OnFaviconDataAvailable(
       const IconRequest& request,
       const history::FaviconBitmapResult& bitmap_result);
 
+  // Sends the 16x16 DIP 1x default favicon.
+  void SendDefaultResponse(
+      const content::URLDataSource::GotDataCallback& callback);
+
   // Sends the default favicon.
   void SendDefaultResponse(const IconRequest& request);
 
   CancelableTaskTracker cancelable_task_tracker_;
 
   // Raw PNG representations of favicons of each size to show when the favicon
   // database doesn't have a favicon for a webpage. Indexed by IconSize values.
   scoped_refptr<base::RefCountedMemory> default_favicons_[NUM_SIZES];
 
   // The history::IconTypes of icon that this FaviconSource handles.
   int icon_types_;
 
   DISALLOW_COPY_AND_ASSIGN(FaviconSource);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_FAVICON_SOURCE_H_