Don't request missing favicon on every page request.

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 "base/memory/scoped_ptr.h"
 #include "chrome/browser/favicon/favicon_handler.h"
+#include "chrome/browser/favicon/favicon_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/test/base/chrome_render_view_host_test_harness.h"
 #include "content/public/browser/favicon_status.h"
 #include "content/public/browser/invalidate_type.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/web_contents.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/codec/png_codec.h"
 #include "ui/gfx/favicon_size.h"
 #include "ui/gfx/image/image.h"
@@ skipping 996 matching lines @@
   EXPECT_EQ(0U, handler.image_urls().size());
 
   // Verify correct icon size chosen.
   EXPECT_EQ(icon_url_preferred1, handler.GetEntry()->GetFavicon().url);
   EXPECT_TRUE(handler.GetEntry()->GetFavicon().valid);
   EXPECT_FALSE(handler.GetEntry()->GetFavicon().image.IsEmpty());
   EXPECT_EQ(gfx::kFaviconSize,
             handler.GetEntry()->GetFavicon().image.ToSkBitmap()->width());
 }
 
+static ProfileKeyedService* BuildFaviconService(
+    content::BrowserContext* profile) {
+  return new FaviconService(NULL);
+}
+
+TEST_F(FaviconHandlerTest, UnableToDownloadFavicon) {

[sky, 2013/05/09 14:49:47]

Add a description of what this is meant to test.

[mef, 2013/05/09 16:24:24]

Done.

+  const GURL missing_icon_url("http://www.google.com/favicon.ico");
+  const GURL another_icon_url("http://www.youtube.com/favicon.ico");
+
+  Profile* profile = Profile::FromBrowserContext(
+      web_contents()->GetBrowserContext());
+
+  FaviconServiceFactory::GetInstance()->SetTestingFactory(

[sky, 2013/05/09 14:49:47]

Does this need to be unset after your test (or TearDown)?

[mef, 2013/05/09 16:24:24]

Done.

+      profile, BuildFaviconService);
+  FaviconService* favicon_service = FaviconServiceFactory::GetForProfile(
+      profile, Profile::IMPLICIT_ACCESS);
+
+  FaviconTabHelper::CreateForWebContents(web_contents());
+  FaviconTabHelper* favicon_tab_helper =
+      FaviconTabHelper::FromWebContents(web_contents());
+
+  std::vector<SkBitmap> empty_icons;
+
+  int download_id = 0;
+  // Try to download missing icon.
+  download_id = favicon_tab_helper->StartDownload(missing_icon_url, 0);
+  EXPECT_NE(0, download_id);
+  EXPECT_FALSE(favicon_service->WasUnableToDownloadFavicon(missing_icon_url));
+
+  // Report download failure with HTTP 503 status.
+  favicon_tab_helper->DidDownloadFavicon(download_id, 503, missing_icon_url,
+      0, empty_icons);
+  // Icon is not marked as UnableToDownload as HTTP status is not 404.
+  EXPECT_FALSE(favicon_service->WasUnableToDownloadFavicon(missing_icon_url));
+
+  // Try to download again.
+  download_id = favicon_tab_helper->StartDownload(missing_icon_url, 0);
+  EXPECT_NE(0, download_id);
+  EXPECT_FALSE(favicon_service->WasUnableToDownloadFavicon(missing_icon_url));
+
+  // Report download failure with HTTP 404 status.
+  favicon_tab_helper->DidDownloadFavicon(download_id, 404, missing_icon_url,
+      0, empty_icons);
+  // Icon is marked as UnableToDownload.
+  EXPECT_TRUE(favicon_service->WasUnableToDownloadFavicon(missing_icon_url));
+
+  // Try to download again.
+  download_id = favicon_tab_helper->StartDownload(missing_icon_url, 0);
+  // Download is not started and Icon is still marked as UnableToDownload
+  EXPECT_EQ(0, download_id);
+  EXPECT_TRUE(favicon_service->WasUnableToDownloadFavicon(missing_icon_url));
+
+  // Try to download another icon.
+  download_id = favicon_tab_helper->StartDownload(another_icon_url, 0);
+  EXPECT_NE(0, download_id);
+  EXPECT_FALSE(favicon_service->WasUnableToDownloadFavicon(another_icon_url));
+
+  // Clear the list of missing icons.
+  favicon_service->ClearUnableToDownloadFavicons();
+  EXPECT_FALSE(favicon_service->WasUnableToDownloadFavicon(missing_icon_url));
+  EXPECT_FALSE(favicon_service->WasUnableToDownloadFavicon(another_icon_url));
+
+  // Try to download again.
+  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,
+      0, empty_icons);
+  // Icon is not marked as UnableToDownload as HTTP status is not 404.
+  EXPECT_FALSE(favicon_service->WasUnableToDownloadFavicon(missing_icon_url));
+}
+
 }  // namespace.