Extend FaviconService to support fetching favicons from a Google server

components/ntp_tiles/icon_cacher_impl_unittest.cc

 // Copyright 2016 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 "components/ntp_tiles/icon_cacher_impl.h"
 
 #include <utility>
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/ptr_util.h"
@@ skipping 32 matching lines @@
 
 class IconCacherTest : public ::testing::Test {
  protected:
   IconCacherTest()
       : site_(base::string16(),  // title, unused
               GURL("http://url.google/"),
               GURL("http://url.google/icon.png"),
               GURL("http://url.google/favicon.ico"),
               GURL()),  // thumbnail, unused
         image_fetcher_(new ::testing::StrictMock<MockImageFetcher>),
-        favicon_service_(/*favicon_client=*/nullptr, &history_service_) {
+        favicon_service_(/*favicon_client=*/nullptr,
+                         &history_service_,
+                         nullptr) {
     CHECK(history_dir_.CreateUniqueTempDir());
     CHECK(history_service_.Init(
         history::HistoryDatabaseParams(history_dir_.GetPath(), 0, 0)));
   }
 
   void PreloadIcon(const GURL& url,
                    const GURL& icon_url,
                    favicon_base::IconType icon_type,
                    int width,
                    int height) {
@@ skipping 126 matching lines @@
 
   IconCacherImpl cacher(&favicon_service_, std::move(image_fetcher_));
   cacher.StartFetch(site_, BindMockFunction(&done));
   loop.Run();
   EXPECT_FALSE(IconIsCachedFor(site_.url, favicon_base::FAVICON));
   EXPECT_FALSE(IconIsCachedFor(site_.url, favicon_base::TOUCH_ICON));
 }
 
 }  // namespace
 }  // namespace ntp_tiles