[Password Manager] Copiable username and origin. Linkable origin elided from the left.

chrome/browser/ui/webui/large_icon_source.h

 // Copyright 2015 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_LARGE_ICON_SOURCE_H_
 #define CHROME_BROWSER_UI_WEBUI_LARGE_ICON_SOURCE_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "components/favicon/core/fallback_icon_service.h"
 #include "content/public/browser/url_data_source.h"
 
 namespace favicon {
 class FallbackIconService;
 class LargeIconService;
 }
 
 namespace favicon_base {
 struct LargeIconResult;
 }
 
 // LargeIconSource services explicit chrome:// requests for large icons.
 //
 // Format:
 //   chrome://large-icon/size/url
+// or
+//   chrome://large-icon/size/fallback/fallback_params/url
 //
 // Parameter:
 //  'size'             Required (including trailing '/')
 //    Positive integer to specify the large icon's size in pixels.
+//  fallback_params    Optional
+//    5 comma-separated parameters of fallback icon in the format described at
+//    the top of the file "chrome/browser/ui/webui/fallback_icon_source.h".
 //  'url'              Optional
 //    String to specify the page URL of the large icon.
 //
-//  Example: chrome://large-icon/48/http://www.google.com/
-//    This requests a 48x48 large icon for http://www.google.com.
+//  Examples:
+//    chrome://large-icon/48/http://www.google.com/
+//      This requests a 48x48 large icon for http://www.google.com.
+//    chrome://large-icon/16/fallback/,777,FFF,0.625,0.4/http://example.com

[Evan Stade, 2015/10/15 23:46:32]

I don't think you should be passing this fallback stuff into C++, can't you do
this all in css?

see how multiple background urls can be used as a fallback in case one fails to
load: https://jsfiddle.net/82oqoepe/1/

[kolos1, 2015/10/16 14:19:25]

Thanks. That is very interesting idea, but what if the regular icon is partially
transparent. Is it possible to disable transparency of a background image? I
didn't find so far.

+//      If there is no icon for example.com, the style of fallback icon will be
+//      specified with listed parameters.
 class LargeIconSource : public content::URLDataSource {
  public:
   // |fallback_icon_service| and |large_icon_service| are owned by caller and
   // may be null.
   LargeIconSource(favicon::FallbackIconService* fallback_icon_service,
                   favicon::LargeIconService* large_icon_service);
 
   ~LargeIconSource() override;
 
   // content::URLDataSource implementation.
@@ skipping 24 matching lines @@
   // Owned by client.
   favicon::FallbackIconService* fallback_icon_service_;
 
   // Owned by client.
   favicon::LargeIconService* large_icon_service_;
 
   DISALLOW_COPY_AND_ASSIGN(LargeIconSource);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_LARGE_ICON_SOURCE_H_