Add Observer in FaviconTabHelper

chrome/browser/favicon/favicon_handler_unittest.cc

 // 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.
 
 #include "chrome/browser/favicon/favicon_handler.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/favicon/chrome_favicon_client.h"
 #include "chrome/browser/favicon/chrome_favicon_client_factory.h"
 #include "chrome/browser/favicon/favicon_service.h"
@@ skipping 209 matching lines @@
     return -1;
   }
 
   void NotifyFaviconUpdated(bool icon_url_changed) override {
     ADD_FAILURE() << "TestFaviconDriver::NotifyFaviconUpdated() "
                   << "should never be called in tests.";
   }
 
   void SetActiveURL(GURL url) { url_ = url; }
 
+  void OnFaviconAvailable(const gfx::Image& image) {
+    available_image_ = image;
+  }
+
+  const gfx::Image GetAvailableImage() {
+    return available_image_;
+  }
+
  private:
   GURL favicon_url_;
   GURL url_;
   gfx::Image image_;
   bool favicon_validity_;
+  gfx::Image available_image_;
   DISALLOW_COPY_AND_ASSIGN(TestFaviconDriver);
 };
 
 // This class is used to catch the FaviconHandler's download and history
 // request, and also provide the methods to access the FaviconHandler
 // internals.
 class TestFaviconHandler : public FaviconHandler {
  public:
   static int GetMaximalIconSize(favicon_base::IconType icon_type) {
     return FaviconHandler::GetMaximalIconSize(icon_type);
@@ skipping 1297 matching lines @@
   download_id = favicon_tab_helper->StartDownload(missing_icon_url, 0);
   EXPECT_NE(0, download_id);
   // Report download success with HTTP 200 status.
   favicon_tab_helper->DidDownloadFavicon(download_id, 200, missing_icon_url,
       empty_icons, empty_icon_sizes);
   // Icon is not marked as UnableToDownload as HTTP status is not 404.
   EXPECT_FALSE(favicon_service->WasUnableToDownloadFavicon(missing_icon_url));
 }
 
 }  // namespace.