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

chrome/browser/ui/webui/favicon_source.h

Index: chrome/browser/ui/webui/favicon_source.h
diff --git a/chrome/browser/ui/webui/favicon_source.h b/chrome/browser/ui/webui/favicon_source.h
index ea35911856ba6d88538adbe438530b02c61ff1f0..02eae118cb4e217919eef0807ffafc87725414fc 100644
--- a/chrome/browser/ui/webui/favicon_source.h
+++ b/chrome/browser/ui/webui/favicon_source.h
@@ -19,6 +19,38 @@ 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.
@@ -80,6 +112,10 @@ class FaviconSource : public content::URLDataSource {
       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);