Support touch icon in FaviconHelper

chrome/browser/favicon_helper_unittest.cc

Index: chrome/browser/favicon_helper_unittest.cc
diff --git a/chrome/browser/favicon_helper_unittest.cc b/chrome/browser/favicon_helper_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7b4d7babe0a738bb95b51bba0f91cc1d7b649c40
--- /dev/null
+++ b/chrome/browser/favicon_helper_unittest.cc
@@ -0,0 +1,767 @@
+// Copyright (c) 2011 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_helper.h"
+
+#include "content/browser/renderer_host/test_render_view_host.h"
+#include "content/browser/tab_contents/navigation_entry.h"
+#include "content/browser/tab_contents/test_tab_contents.h"
+#include "ui/gfx/codec/png_codec.h"
+#include "ui/gfx/favicon_size.h"
+
+class TestFaviconHelper;
+
+namespace {
+
+// Fill the given bmp with valid png data.
+void FillDataToBitmap(int w, int h, SkBitmap* bmp) {
+  bmp->setConfig(SkBitmap::kARGB_8888_Config, w, h);
+  bmp->allocPixels();
+
+  unsigned char* src_data =
+      reinterpret_cast<unsigned char*>(bmp->getAddr32(0, 0));
+  for (int i = 0; i < w * h; i++) {
+    src_data[i * 4 + 0] = static_cast<unsigned char>(i % 255);
+    src_data[i * 4 + 1] = static_cast<unsigned char>(i % 255);
+    src_data[i * 4 + 2] = static_cast<unsigned char>(i % 255);
+    src_data[i * 4 + 3] = static_cast<unsigned char>(i % 255);
+  }
+}
+
+// Fill the given data buffer with valid png data.
+void FillBitmap(int w, int h, std::vector<unsigned char>* output) {
+  SkBitmap bitmap;
+  FillDataToBitmap(w, h, &bitmap);
+  gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, false, output);
+}
+
+// This class is used to save the download request for verifying with test case.
+// It also will be used to invoke the onDidDownload callback.
+class DownloadHandler {
+ public:
+  DownloadHandler(int download_id,
+                  const GURL& image_url,
+                  int image_size,
+                  TestFaviconHelper* favicon_helper)
+    : image_url_(image_url),
+      image_size_(image_size),
+      failed_(false),
+      download_id_(download_id),
+      favicon_helper_(favicon_helper) {
+    FillDataToBitmap(16, 16, &bitmap_);
+  }
+
+  virtual ~DownloadHandler() {
+  }
+
+  static void UpdateFaviconURL(FaviconHelper* helper,
+                               const std::vector<FaviconURL> urls);
+
+  void InvokeCallback();
+
+  void UpdateFaviconURL(const std::vector<FaviconURL> urls);
+
+  const GURL image_url_;
+  const int image_size_;
+
+  // Simulates download failed or not.
+  bool failed_;
+
+ private:
+  // Identified the specific download, will also be passed in
+  // OnDidDownloadFavicon callback.
+  int download_id_;
+  TestFaviconHelper* favicon_helper_;
+  SkBitmap bitmap_;
+
+  DISALLOW_COPY_AND_ASSIGN(DownloadHandler);
+};
+
+// This class is used to save the history request for verifying with test case.
+// It also will be used to simulate the history response.
+class HistoryRequestHandler {
+ public:
+  HistoryRequestHandler(const GURL& page_url,
+                        const GURL& icon_url,
+                        int icon_type,
+                        FaviconService::FaviconDataCallback* callback)
+    : page_url_(page_url),
+      icon_url_(icon_url),
+      icon_type_(icon_type),
+      callback_(callback) {
+  }
+
+  HistoryRequestHandler(const GURL& page_url,
+                        const GURL& icon_url,
+                        int icon_type,
+                        const std::vector<unsigned char>& image_data,
+                        FaviconService::FaviconDataCallback* callback)
+    : page_url_(page_url),
+      icon_url_(icon_url),
+      icon_type_(icon_type),
+      image_data_(image_data),
+      callback_(callback) {
+  }
+
+  virtual ~HistoryRequestHandler() {
+    delete callback_;
+  }
+  void InvokeCallback();
+
+  const GURL page_url_;
+  const GURL icon_url_;
+  const int icon_type_;
+  const std::vector<unsigned char> image_data_;
+  history::FaviconData favicon_data_;
+  FaviconService::FaviconDataCallback* callback_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(HistoryRequestHandler);
+};
+
+}  // namespace
+
+// This class is used to catch the FaviconHelper's download and history request,
+// and also provide the methods to access the FaviconHelper internal.
+class TestFaviconHelper : public FaviconHelper {
+ public:
+  TestFaviconHelper(const GURL& page_url,
+                    TabContents* tab_contents,
+                    Type type)
+    : FaviconHelper(tab_contents, type),
+      download_image_size_(0),
+      download_id_(0),
+      tab_contents_(tab_contents){
+    entry_.set_url(page_url);
+  }
+
+  virtual ~TestFaviconHelper() {
+  }
+
+  HistoryRequestHandler* history_handler() {
+    return history_handler_.get();
+  }
+
+  // This method will take the ownership of the given handler.
+  void set_history_handler(HistoryRequestHandler* handler) {
+    history_handler_.reset(handler);
+  }
+
+  DownloadHandler* download_handler() {
+    return download_handler_.get();
+  }
+
+  // This method will take the ownership of the given download_handler.
+  void set_download_handler(DownloadHandler* download_handler) {
+    download_handler_.reset(download_handler);
+  }
+
+  virtual NavigationEntry* GetEntry() {
+    return &entry_;
+  }
+
+  const std::vector<FaviconURL>& urls() {
+    return urls_;
+  }
+
+  void FetchFavicon(const GURL& url) {
+    FaviconHelper::FetchFavicon(url);
+  }
+
+  // The methods to access favicon internal.
+  FaviconURL* current_candidate() {
+    return FaviconHelper::current_candidate();
+  }
+
+  void OnDidDownloadFavicon(int id,
+                            const GURL& image_url,
+                            bool errored,
+                            const SkBitmap& image) {
+    FaviconHelper::OnDidDownloadFavicon(id, image_url, errored, image);
+  }
+
+ protected:
+  virtual void UpdateFaviconMappingAndFetch(
+      const GURL& page_url,
+      const GURL& icon_url,
+      history::IconType icon_type,
+      CancelableRequestConsumerBase* consumer,
+      FaviconService::FaviconDataCallback* callback) OVERRIDE {
+    history_handler_.reset(new HistoryRequestHandler(page_url, icon_url,
+                                                     icon_type, callback));
+  }
+
+  virtual void GetFavicon(
+      const GURL& icon_url,
+      history::IconType icon_type,
+      CancelableRequestConsumerBase* consumer,
+      FaviconService::FaviconDataCallback* callback) OVERRIDE {
+    history_handler_.reset(new HistoryRequestHandler(GURL(), icon_url,
+                                                     icon_type, callback));
+  }
+
+  virtual void GetFaviconForURL(
+      const GURL& page_url,
+      int icon_types,
+      CancelableRequestConsumerBase* consumer,
+      FaviconService::FaviconDataCallback* callback) OVERRIDE {
+    history_handler_.reset(new HistoryRequestHandler(page_url, GURL(),
+                                                     icon_types, callback));
+  }
+
+  virtual int DownloadFavicon(const GURL& image_url, int image_size) OVERRIDE {
+    download_id_++;
+    download_handler_.reset(new DownloadHandler(download_id_, image_url,
+                                                image_size, this));
+    return download_id_;
+  }
+
+  virtual void SetHistoryFavicon(const GURL& page_url,
+                                 const GURL& icon_url,
+                                 const std::vector<unsigned char>& image_data,
+                                 history::IconType icon_type) OVERRIDE {
+    history_handler_.reset(new HistoryRequestHandler(page_url, icon_url,
+        icon_type, image_data, NULL));
+  }
+
+  virtual FaviconService* GetFaviconService() OVERRIDE {
+    // Just give none NULL value, so overridden methods can be hit.
+    return (FaviconService*)(1);
+  }
+
+  virtual bool ShouldSaveFavicon(const GURL& url) OVERRIDE {
+    return true;
+  }
+
+  GURL page_url_;
+
+  GURL download_image_url_;
+  int download_image_size_;
+
+ private:
+  NavigationEntry entry_;
+
+  // The unique id of a download request. It will be returned to a
+  // FaviconHelper.
+  int download_id_;
+
+  TabContents* tab_contents_;
+  scoped_ptr<DownloadHandler> download_handler_;
+  scoped_ptr<HistoryRequestHandler> history_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestFaviconHelper);
+};
+
+namespace {
+
+void DownloadHandler::UpdateFaviconURL(FaviconHelper* helper,
+                                       const std::vector<FaviconURL> urls) {
+  helper->OnUpdateFaviconURL(0, urls);
+}
+
+void DownloadHandler::UpdateFaviconURL(const std::vector<FaviconURL> urls) {
+  UpdateFaviconURL(favicon_helper_, urls);
+}
+
+void DownloadHandler::InvokeCallback() {
+  favicon_helper_->OnDidDownloadFavicon(download_id_, image_url_, failed_,
+                                        bitmap_);
+}
+
+void HistoryRequestHandler::InvokeCallback() {
+  callback_->Run(0, favicon_data_);
+}
+
+class FaviconHelperTest : public RenderViewHostTestHarness {
+};
+
+TEST_F(FaviconHelperTest, GetFaviconFromHistory) {
+  const GURL page_url("http://www.google.com");
+  const GURL icon_url("http://www.google.com/favicon");
+
+  TestFaviconHelper helper(page_url, contents(), FaviconHelper::FAVICON);
+
+  helper.FetchFavicon(page_url);
+  HistoryRequestHandler* history_handler = helper.history_handler();
+  // Ensure the data given to history is correct.
+  ASSERT_TRUE(history_handler);
+  EXPECT_EQ(page_url, history_handler->page_url_);
+  EXPECT_EQ(GURL(), history_handler->icon_url_);
+  EXPECT_EQ(history::FAVICON, history_handler->icon_type_);
+
+  // Set valid icon data.
+  history_handler->favicon_data_.known_icon = true;
+  history_handler->favicon_data_.icon_type = history::FAVICON;
+  history_handler->favicon_data_.expired = false;
+  history_handler->favicon_data_.icon_url = icon_url;
+  scoped_refptr<RefCountedBytes> data = new RefCountedBytes();
+  FillBitmap(kFaviconSize, kFaviconSize, &data->data);
+  history_handler->favicon_data_.image_data = data;
+
+  // Send history response.
+  history_handler->InvokeCallback();
+  // Verify FaviconHelper status
+  EXPECT_TRUE(helper.GetEntry()->favicon().is_valid());
+  EXPECT_EQ(icon_url, helper.GetEntry()->favicon().url());
+
+  // Simulates update favicon url.
+  std::vector<FaviconURL> urls;
+  urls.push_back(FaviconURL(icon_url, FAVICON));
+  DownloadHandler::UpdateFaviconURL(&helper, urls);
+
+  // Verify FaviconHelper status
+  EXPECT_EQ(1U, helper.urls().size());
+  ASSERT_TRUE(helper.current_candidate());
+  ASSERT_EQ(icon_url, helper.current_candidate()->icon_url);
+  ASSERT_EQ(FAVICON, helper.current_candidate()->icon_type);
+
+  // Favicon shouldn't request to download icon.
+  DownloadHandler* download_handler = helper.download_handler();
+  ASSERT_FALSE(download_handler);
+}
+
+TEST_F(FaviconHelperTest, DownloadFavicon) {
+  const GURL page_url("http://www.google.com");
+  const GURL icon_url("http://www.google.com/favicon");
+
+  TestFaviconHelper helper(page_url, contents(), FaviconHelper::FAVICON);
+
+  helper.FetchFavicon(page_url);
+  HistoryRequestHandler* history_handler = helper.history_handler();
+  // Ensure the data given to history is correct.
+  ASSERT_TRUE(history_handler);
+  EXPECT_EQ(page_url, history_handler->page_url_);
+  EXPECT_EQ(GURL(), history_handler->icon_url_);
+  EXPECT_EQ(history::FAVICON, history_handler->icon_type_);
+
+  // Set icon data expired
+  history_handler->favicon_data_.known_icon = true;
+  history_handler->favicon_data_.icon_type = history::FAVICON;
+  history_handler->favicon_data_.expired = true;
+  history_handler->favicon_data_.icon_url = icon_url;
+  // Send history response.
+  history_handler->InvokeCallback();
+  // Verify FaviconHelper status
+  EXPECT_TRUE(helper.GetEntry()->favicon().is_valid());
+  EXPECT_EQ(icon_url, helper.GetEntry()->favicon().url());
+
+  // Simulates update favicon url.
+  std::vector<FaviconURL> urls;
+  urls.push_back(FaviconURL(icon_url, FAVICON));
+  DownloadHandler::UpdateFaviconURL(&helper, urls);
+
+  // Verify FaviconHelper status
+  EXPECT_EQ(1U, helper.urls().size());
+  ASSERT_TRUE(helper.current_candidate());
+  ASSERT_EQ(icon_url, helper.current_candidate()->icon_url);
+  ASSERT_EQ(FAVICON, helper.current_candidate()->icon_type);
+
+  // Favicon should request to download icon now.
+  DownloadHandler* download_handler = helper.download_handler();
+  ASSERT_TRUE(download_handler);
+  // Verify the download request.
+  EXPECT_EQ(icon_url, download_handler->image_url_);
+  EXPECT_EQ(kFaviconSize, download_handler->image_size_);
+
+  // Reset the history_handler to verify whether favicon is set.
+  helper.set_history_handler(NULL);
+
+  // Smulates download done.
+  download_handler->InvokeCallback();
+
+  // New icon should be saved to history backend and navigation entry.
+  history_handler = helper.history_handler();
+  ASSERT_TRUE(history_handler);
+  EXPECT_EQ(icon_url, history_handler->icon_url_);
+  EXPECT_EQ(FAVICON, history_handler->icon_type_);
+  EXPECT_LT(0U, history_handler->image_data_.size());
+  EXPECT_EQ(page_url, history_handler->page_url_);
+
+  // Verify NavigationEntry.
+  EXPECT_EQ(icon_url, helper.GetEntry()->favicon().url());
+  EXPECT_TRUE(helper.GetEntry()->favicon().is_valid());
+  EXPECT_FALSE(helper.GetEntry()->favicon().bitmap().empty());
+}
+
+TEST_F(FaviconHelperTest, UpdateAndDownloadFavicon) {
+  const GURL page_url("http://www.google.com");
+  const GURL icon_url("http://www.google.com/favicon");
+  const GURL new_icon_url("http://www.google.com/new_favicon");
+
+  TestFaviconHelper helper(page_url, contents(), FaviconHelper::FAVICON);
+
+  helper.FetchFavicon(page_url);
+  HistoryRequestHandler* history_handler = helper.history_handler();
+  // Ensure the data given to history is correct.
+  ASSERT_TRUE(history_handler);
+  EXPECT_EQ(page_url, history_handler->page_url_);
+  EXPECT_EQ(GURL(), history_handler->icon_url_);
+  EXPECT_EQ(history::FAVICON, history_handler->icon_type_);
+
+  // Set valid icon data.
+  history_handler->favicon_data_.known_icon = true;
+  history_handler->favicon_data_.icon_type = history::FAVICON;
+  history_handler->favicon_data_.expired = false;
+  history_handler->favicon_data_.icon_url = icon_url;
+  scoped_refptr<RefCountedBytes> data = new RefCountedBytes();
+  FillBitmap(kFaviconSize, kFaviconSize, &data->data);
+  history_handler->favicon_data_.image_data = data;
+
+  // Send history response.
+  history_handler->InvokeCallback();
+  // Verify FaviconHelper status.
+  EXPECT_TRUE(helper.GetEntry()->favicon().is_valid());
+  EXPECT_EQ(icon_url, helper.GetEntry()->favicon().url());
+
+  // Reset the history_handler to verify whether new icon is requested from
+  // history.
+  helper.set_history_handler(NULL);
+
+  // Simulates update with the different favicon url.
+  std::vector<FaviconURL> urls;
+  urls.push_back(FaviconURL(new_icon_url, FAVICON));
+  DownloadHandler::UpdateFaviconURL(&helper, urls);
+
+  // Verify FaviconHelper status.
+  EXPECT_EQ(1U, helper.urls().size());
+  ASSERT_TRUE(helper.current_candidate());
+  ASSERT_EQ(new_icon_url, helper.current_candidate()->icon_url);
+  ASSERT_EQ(FAVICON, helper.current_candidate()->icon_type);
+  // The favicon status's url should be updated.
+  ASSERT_EQ(new_icon_url, helper.GetEntry()->favicon().url());
+
+  // Favicon should be requested from history.
+  history_handler = helper.history_handler();
+  ASSERT_TRUE(history_handler);
+  EXPECT_EQ(new_icon_url, history_handler->icon_url_);
+  EXPECT_EQ(FAVICON, history_handler->icon_type_);
+  EXPECT_EQ(page_url, history_handler->page_url_);
+
+  // Simulate not find icon.
+  history_handler->favicon_data_.known_icon = false;
+  history_handler->InvokeCallback();
+
+  // Favicon should request to download icon now.
+  DownloadHandler* download_handler = helper.download_handler();
+  ASSERT_TRUE(download_handler);
+  // Verify the download request.
+  EXPECT_EQ(new_icon_url, download_handler->image_url_);
+  EXPECT_EQ(kFaviconSize, download_handler->image_size_);
+
+  // Reset the history_handler to verify whether favicon is set.
+  helper.set_history_handler(NULL);
+
+  // Smulates download done.
+  download_handler->InvokeCallback();
+
+  // New icon should be saved to history backend and navigation entry.
+  history_handler = helper.history_handler();
+  ASSERT_TRUE(history_handler);
+  EXPECT_EQ(new_icon_url, history_handler->icon_url_);
+  EXPECT_EQ(FAVICON, history_handler->icon_type_);
+  EXPECT_LT(0U, history_handler->image_data_.size());
+  EXPECT_EQ(page_url, history_handler->page_url_);
+
+  // Verify NavigationEntry.
+  EXPECT_EQ(new_icon_url, helper.GetEntry()->favicon().url());
+  EXPECT_TRUE(helper.GetEntry()->favicon().is_valid());
+  EXPECT_FALSE(helper.GetEntry()->favicon().bitmap().empty());
+}
+
+TEST_F(FaviconHelperTest, UpdateFavicon) {
+  const GURL page_url("http://www.google.com");
+  const GURL icon_url("http://www.google.com/favicon");
+  const GURL new_icon_url("http://www.google.com/new_favicon");
+
+  TestFaviconHelper helper(page_url, contents(), FaviconHelper::FAVICON);
+
+  helper.FetchFavicon(page_url);
+  HistoryRequestHandler* history_handler = helper.history_handler();
+  // Ensure the data given to history is correct.
+  ASSERT_TRUE(history_handler);
+  EXPECT_EQ(page_url, history_handler->page_url_);
+  EXPECT_EQ(GURL(), history_handler->icon_url_);
+  EXPECT_EQ(history::FAVICON, history_handler->icon_type_);
+
+  // Set valid icon data.
+  history_handler->favicon_data_.known_icon = true;
+  history_handler->favicon_data_.icon_type = history::FAVICON;
+  history_handler->favicon_data_.expired = false;
+  history_handler->favicon_data_.icon_url = icon_url;
+  scoped_refptr<RefCountedBytes> data = new RefCountedBytes();
+  FillBitmap(kFaviconSize, kFaviconSize, &data->data);
+  history_handler->favicon_data_.image_data = data;
+
+  // Send history response.
+  history_handler->InvokeCallback();
+  // Verify FaviconHelper status.
+  EXPECT_TRUE(helper.GetEntry()->favicon().is_valid());
+  EXPECT_EQ(icon_url, helper.GetEntry()->favicon().url());
+
+  // Reset the history_handler to verify whether new icon is requested from
+  // history.
+  helper.set_history_handler(NULL);
+
+  // Simulates update with the different favicon url.
+  std::vector<FaviconURL> urls;
+  urls.push_back(FaviconURL(new_icon_url, FAVICON));
+  DownloadHandler::UpdateFaviconURL(&helper, urls);
+
+  // Verify FaviconHelper status.
+  EXPECT_EQ(1U, helper.urls().size());
+  ASSERT_TRUE(helper.current_candidate());
+  ASSERT_EQ(new_icon_url, helper.current_candidate()->icon_url);
+  ASSERT_EQ(FAVICON, helper.current_candidate()->icon_type);
+  // The favicon status's url should be updated.
+  ASSERT_EQ(new_icon_url, helper.GetEntry()->favicon().url());
+
+  // Favicon should be requested from history.
+  history_handler = helper.history_handler();
+  ASSERT_TRUE(history_handler);
+  EXPECT_EQ(new_icon_url, history_handler->icon_url_);
+  EXPECT_EQ(FAVICON, history_handler->icon_type_);
+  EXPECT_EQ(page_url, history_handler->page_url_);
+
+  // Simulate find icon.
+  history_handler->favicon_data_.known_icon = true;
+  history_handler->favicon_data_.icon_type = history::FAVICON;
+  history_handler->favicon_data_.expired = false;
+  history_handler->favicon_data_.icon_url = new_icon_url;
+  history_handler->favicon_data_.image_data = data;
+  history_handler->InvokeCallback();
+
+  // Shouldn't request download favicon
+  EXPECT_FALSE(helper.download_handler());
+
+  // Verify the favicon status.
+  EXPECT_EQ(new_icon_url, helper.GetEntry()->favicon().url());
+  EXPECT_TRUE(helper.GetEntry()->favicon().is_valid());
+  EXPECT_FALSE(helper.GetEntry()->favicon().bitmap().empty());
+}
+
+TEST_F(FaviconHelperTest, Download2ndFaviconURLCandidate) {
+  const GURL page_url("http://www.google.com");
+  const GURL icon_url("http://www.google.com/favicon");
+  const GURL new_icon_url("http://www.google.com/new_favicon");
+
+  TestFaviconHelper helper(page_url, contents(), FaviconHelper::TOUCH);
+
+  helper.FetchFavicon(page_url);
+  HistoryRequestHandler* history_handler = helper.history_handler();
+  // Ensure the data given to history is correct.
+  ASSERT_TRUE(history_handler);
+  EXPECT_EQ(page_url, history_handler->page_url_);
+  EXPECT_EQ(GURL(), history_handler->icon_url_);
+  EXPECT_EQ(history::TOUCH_PRECOMPOSED_ICON | history::TOUCH_ICON,
+            history_handler->icon_type_);
+
+  // Icon not found.
+  history_handler->favicon_data_.known_icon = false;
+  // Send history response.
+  history_handler->InvokeCallback();
+  // Verify FaviconHelper status.
+  EXPECT_FALSE(helper.GetEntry()->favicon().is_valid());
+  EXPECT_EQ(GURL(), helper.GetEntry()->favicon().url());
+
+  // Reset the history_handler to verify whether new icon is requested from
+  // history.
+  helper.set_history_handler(NULL);
+
+  // Simulates update with the different favicon url.
+  std::vector<FaviconURL> urls;
+  urls.push_back(FaviconURL(icon_url, TOUCH_PRECOMPOSED_ICON));
+  urls.push_back(FaviconURL(new_icon_url, TOUCH_ICON));
+  urls.push_back(FaviconURL(new_icon_url, FAVICON));
+
+  DownloadHandler::UpdateFaviconURL(&helper, urls);
+
+  // Verify FaviconHelper status.
+  EXPECT_EQ(2U, helper.urls().size());
+  ASSERT_TRUE(helper.current_candidate());
+  ASSERT_EQ(icon_url, helper.current_candidate()->icon_url);
+  ASSERT_EQ(TOUCH_PRECOMPOSED_ICON, helper.current_candidate()->icon_type);
+
+  // Favicon should be requested from history.
+  history_handler = helper.history_handler();
+  ASSERT_TRUE(history_handler);
+  EXPECT_EQ(icon_url, history_handler->icon_url_);
+  EXPECT_EQ(TOUCH_PRECOMPOSED_ICON, history_handler->icon_type_);
+  EXPECT_EQ(page_url, history_handler->page_url_);
+
+  // Simulate not find icon.
+  history_handler->favicon_data_.known_icon = false;
+  history_handler->InvokeCallback();
+
+  // Should request download favicon.
+  DownloadHandler* download_handler = helper.download_handler();
+  EXPECT_TRUE(download_handler);
+  // Verify the download request.
+  EXPECT_EQ(icon_url, download_handler->image_url_);
+  EXPECT_EQ(0, download_handler->image_size_);
+
+  // Reset the history_handler to verify whether favicon is request from
+  // history.
+  helper.set_history_handler(NULL);
+  // Smulates download failed.
+  download_handler->failed_ = true;
+  download_handler->InvokeCallback();
+
+  // Left 1 url.
+  EXPECT_EQ(1U, helper.urls().size());
+  ASSERT_TRUE(helper.current_candidate());
+  EXPECT_EQ(new_icon_url, helper.current_candidate()->icon_url);
+  EXPECT_EQ(TOUCH_ICON, helper.current_candidate()->icon_type);
+
+  // Favicon should be requested from history.
+  history_handler = helper.history_handler();
+  ASSERT_TRUE(history_handler);
+  EXPECT_EQ(new_icon_url, history_handler->icon_url_);
+  EXPECT_EQ(TOUCH_ICON, history_handler->icon_type_);
+  EXPECT_EQ(page_url, history_handler->page_url_);
+
+  // Reset download handler
+  helper.set_download_handler(NULL);
+
+  // Smulates getting a expired icon from history.
+  history_handler->favicon_data_.known_icon = true;
+  history_handler->favicon_data_.icon_type = history::TOUCH_ICON;
+  history_handler->favicon_data_.expired = true;
+  history_handler->favicon_data_.icon_url = new_icon_url;
+  scoped_refptr<RefCountedBytes> data = new RefCountedBytes();
+  FillBitmap(kFaviconSize, kFaviconSize, &data->data);
+  history_handler->favicon_data_.image_data = data;
+  history_handler->InvokeCallback();
+
+  // Verify the download request.
+  download_handler = helper.download_handler();
+  EXPECT_TRUE(download_handler);
+  EXPECT_EQ(new_icon_url, download_handler->image_url_);
+  EXPECT_EQ(0, download_handler->image_size_);
+
+  helper.set_history_handler(NULL);
+
+  // Simulates icon being downloaded.
+  download_handler->InvokeCallback();
+
+  // New icon should be saved to history backend.
+  history_handler = helper.history_handler();
+  ASSERT_TRUE(history_handler);
+  EXPECT_EQ(new_icon_url, history_handler->icon_url_);
+  EXPECT_EQ(TOUCH_ICON, history_handler->icon_type_);
+  EXPECT_LT(0U, history_handler->image_data_.size());
+  EXPECT_EQ(page_url, history_handler->page_url_);
+}
+
+TEST_F(FaviconHelperTest, UpdateDuringDownloading) {
+  const GURL page_url("http://www.google.com");
+  const GURL icon_url("http://www.google.com/favicon");
+  const GURL new_icon_url("http://www.google.com/new_favicon");
+
+  TestFaviconHelper helper(page_url, contents(), FaviconHelper::TOUCH);
+
+  helper.FetchFavicon(page_url);
+  HistoryRequestHandler* history_handler = helper.history_handler();
+  // Ensure the data given to history is correct.
+  ASSERT_TRUE(history_handler);
+  EXPECT_EQ(page_url, history_handler->page_url_);
+  EXPECT_EQ(GURL(), history_handler->icon_url_);
+  EXPECT_EQ(history::TOUCH_PRECOMPOSED_ICON | history::TOUCH_ICON,
+            history_handler->icon_type_);
+
+  // Icon not found.
+  history_handler->favicon_data_.known_icon = false;
+  // Send history response.
+  history_handler->InvokeCallback();
+  // Verify FaviconHelper status.
+  EXPECT_FALSE(helper.GetEntry()->favicon().is_valid());
+  EXPECT_EQ(GURL(), helper.GetEntry()->favicon().url());
+
+  // Reset the history_handler to verify whether new icon is requested from
+  // history.
+  helper.set_history_handler(NULL);
+
+  // Simulates update with the different favicon url.
+  std::vector<FaviconURL> urls;
+  urls.push_back(FaviconURL(icon_url, TOUCH_PRECOMPOSED_ICON));
+  urls.push_back(FaviconURL(new_icon_url, TOUCH_ICON));
+  urls.push_back(FaviconURL(new_icon_url, FAVICON));
+
+  DownloadHandler::UpdateFaviconURL(&helper, urls);
+
+  // Verify FaviconHelper status.
+  EXPECT_EQ(2U, helper.urls().size());
+  ASSERT_TRUE(helper.current_candidate());
+  ASSERT_EQ(icon_url, helper.current_candidate()->icon_url);
+  ASSERT_EQ(TOUCH_PRECOMPOSED_ICON, helper.current_candidate()->icon_type);
+
+  // Favicon should be requested from history.
+  history_handler = helper.history_handler();
+  ASSERT_TRUE(history_handler);
+  EXPECT_EQ(icon_url, history_handler->icon_url_);
+  EXPECT_EQ(TOUCH_PRECOMPOSED_ICON, history_handler->icon_type_);
+  EXPECT_EQ(page_url, history_handler->page_url_);
+
+  // Simulate not find icon.
+  history_handler->favicon_data_.known_icon = false;
+  history_handler->InvokeCallback();
+
+  // Should request download favicon.
+  DownloadHandler* download_handler = helper.download_handler();
+  EXPECT_TRUE(download_handler);
+  // Verify the download request.
+  EXPECT_EQ(icon_url, download_handler->image_url_);
+  EXPECT_EQ(0, download_handler->image_size_);
+
+  // Reset the history_handler to verify whether favicon is request from
+  // history.
+  helper.set_history_handler(NULL);
+  const GURL latest_icon_url("http://www.google.com/latest_favicon");
+  std::vector<FaviconURL> latest_urls;
+  latest_urls.push_back(FaviconURL(latest_icon_url, TOUCH_ICON));
+  DownloadHandler::UpdateFaviconURL(&helper, latest_urls);
+  EXPECT_EQ(1U, helper.urls().size());
+  EXPECT_EQ(latest_icon_url, helper.current_candidate()->icon_url);
+  EXPECT_EQ(TOUCH_ICON, helper.current_candidate()->icon_type);
+
+  // Whether new icon is requested from history
+  history_handler = helper.history_handler();
+  ASSERT_TRUE(history_handler);
+  EXPECT_EQ(latest_icon_url, history_handler->icon_url_);
+  EXPECT_EQ(TOUCH_ICON, history_handler->icon_type_);
+  EXPECT_EQ(page_url, history_handler->page_url_);
+
+  // Reset the history_handler to verify whether favicon is request from
+  // history.
+  // Save the callback for late use.
+  FaviconService::FaviconDataCallback* callback = history_handler->callback_;
+  // Prevent the callback from being released.
+  history_handler->callback_ = NULL;
+  helper.set_history_handler(NULL);
+
+  // Smulates download succeed.
+  download_handler->InvokeCallback();
+  // The downloaded icon should be thrown away as there is faviocn update.
+  EXPECT_FALSE(helper.history_handler());
+
+  helper.set_download_handler(NULL);
+
+  // Smulates getting the icon from history.
+  scoped_ptr<HistoryRequestHandler> handler;
+  handler.reset(new HistoryRequestHandler(page_url, latest_icon_url,
+                                          history::TOUCH_ICON, callback));
+  handler->favicon_data_.known_icon = true;
+  handler->favicon_data_.expired = false;
+  handler->favicon_data_.icon_type = history::TOUCH_ICON;
+  handler->favicon_data_.icon_url = latest_icon_url;
+  scoped_refptr<RefCountedBytes> data = new RefCountedBytes();
+  FillBitmap(kFaviconSize, kFaviconSize, &data->data);
+  handler->favicon_data_.image_data = data;
+
+  handler->InvokeCallback();
+
+  // No download request.
+  EXPECT_FALSE(helper.download_handler());
+}
+
+}  // namespace.