[Fallback Icons] Refactor FallbackIconService to be a BrowserContext-level singleton

- FallbackIconServiceFactory now get sFallbackIconService singleton from
  BrowserContext.
- FallbackIconClient & ChromeFallbackIconClient: wrap external code so the Favicon
  component won't have to include them. Specifically:
  - Choosing fonts: also removed duplicate code.
  - Extracting letter from URL to render Fallback.

BUG=455063

Review URL: https://codereview.chromium.org/996253002

Cr-Commit-Position: refs/heads/master@{#322653}

23 files changed, 408 insertions, 81 deletions

diff --git a/chrome/browser/favicon/DEPS b/chrome/browser/favicon/DEPS
index 4dcd7ec..7bc0c6f 100644
--- a/chrome/browser/favicon/DEPS
+++ b/chrome/browser/favicon/DEPS
@@ -12,6 +12,7 @@ include_rules = [
   "+chrome/browser/profiles/incognito_helpers.h",
   "+chrome/browser/search/search.h",
   "+components/favicon/core",
+  "+net/base/registry_controlled_domains/registry_controlled_domain.h",
   "+third_party/skia/include/core/SkBitmap.h",
 
   # TODO(caitkp): Bring this list to zero.
diff --git a/chrome/browser/favicon/chrome_fallback_icon_client.cc b/chrome/browser/favicon/chrome_fallback_icon_client.cc
new file mode 100644
index 0000000..29651d2
--- /dev/null
+++ b/chrome/browser/favicon/chrome_fallback_icon_client.cc
@@ -0,0 +1,41 @@
+// 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.
+
+#include "chrome/browser/favicon/chrome_fallback_icon_client.h"
+
+#include "base/i18n/case_conversion.h"
+#include "base/strings/utf_string_conversions.h"
+#include "grit/platform_locale_settings.h"
+#include "net/base/registry_controlled_domains/registry_controlled_domain.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "url/gurl.h"
+
+ChromeFallbackIconClient::ChromeFallbackIconClient() {
+#if defined(OS_CHROMEOS)
+  font_list_.push_back("Noto Sans");
+#elif defined(OS_IOS)
+  font_list_.push_back("Helvetica Neue");
+#else
+  font_list_.push_back(l10n_util::GetStringUTF8(IDS_SANS_SERIF_FONT_FAMILY));
+#endif
+}
+
+ChromeFallbackIconClient::~ChromeFallbackIconClient() {
+}
+
+const std::vector<std::string>& ChromeFallbackIconClient::GetFontNameList()
+    const {
+  return font_list_;
+}
+
+// Returns a single character to represent |url|. To do this we take the first
+// letter in a domain's name and make it upper case.
+base::string16 ChromeFallbackIconClient::GetFallbackIconText(const GURL& url)
+    const {
+  // TODO(huangs): Handle non-ASCII ("xn--") domain names.
+  std::string domain = net::registry_controlled_domains::GetDomainAndRegistry(
+      url, net::registry_controlled_domains::INCLUDE_PRIVATE_REGISTRIES);
+  return domain.empty() ? base::string16() :
+      base::i18n::ToUpper(base::ASCIIToUTF16(domain.substr(0, 1)));
+}
diff --git a/chrome/browser/favicon/chrome_fallback_icon_client.h b/chrome/browser/favicon/chrome_fallback_icon_client.h
new file mode 100644
index 0000000..1af050d
--- /dev/null
+++ b/chrome/browser/favicon/chrome_fallback_icon_client.h
@@ -0,0 +1,34 @@
+// 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_FAVICON_CHROME_FALLBACK_ICON_CLIENT_H_
+#define CHROME_BROWSER_FAVICON_CHROME_FALLBACK_ICON_CLIENT_H_
+
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "components/favicon/core/fallback_icon_client.h"
+
+class GURL;
+
+// ChromeFallbackIconClient implements the FallbackIconClient interface.
+class ChromeFallbackIconClient : public FallbackIconClient {
+ public:
+  ChromeFallbackIconClient();
+  ~ChromeFallbackIconClient() override;
+
+  // FallbackIconClient implementation:
+  const std::vector<std::string>& GetFontNameList() const override;
+
+  base::string16 GetFallbackIconText(const GURL& url) const override;
+
+ private:
+  std::vector<std::string> font_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeFallbackIconClient);
+};
+
+#endif  // CHROME_BROWSER_FAVICON_CHROME_FALLBACK_ICON_CLIENT_H_
diff --git a/chrome/browser/favicon/chrome_fallback_icon_client_factory.cc b/chrome/browser/favicon/chrome_fallback_icon_client_factory.cc
new file mode 100644
index 0000000..8176a0e
--- /dev/null
+++ b/chrome/browser/favicon/chrome_fallback_icon_client_factory.cc
@@ -0,0 +1,38 @@
+// 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.
+
+#include "chrome/browser/favicon/chrome_fallback_icon_client_factory.h"
+
+#include "base/memory/singleton.h"
+#include "chrome/browser/favicon/chrome_fallback_icon_client.h"
+#include "chrome/browser/profiles/incognito_helpers.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "content/public/browser/browser_context.h"
+
+ChromeFallbackIconClientFactory::ChromeFallbackIconClientFactory()
+    : BrowserContextKeyedServiceFactory(
+        "ChromeFallbackIconClient",
+        BrowserContextDependencyManager::GetInstance()) {
+}
+
+ChromeFallbackIconClientFactory::~ChromeFallbackIconClientFactory() {
+}
+
+// static
+FallbackIconClient* ChromeFallbackIconClientFactory::GetForBrowserContext(
+    content::BrowserContext* context) {
+  return static_cast<FallbackIconClient*>(
+      GetInstance()->GetServiceForBrowserContext(context, true));
+}
+
+// static
+ChromeFallbackIconClientFactory*
+ChromeFallbackIconClientFactory::GetInstance() {
+  return Singleton<ChromeFallbackIconClientFactory>::get();
+}
+
+KeyedService* ChromeFallbackIconClientFactory::BuildServiceInstanceFor(
+    content::BrowserContext* context) const {
+  return new ChromeFallbackIconClient();
+}
diff --git a/chrome/browser/favicon/chrome_fallback_icon_client_factory.h b/chrome/browser/favicon/chrome_fallback_icon_client_factory.h
new file mode 100644
index 0000000..1cbe4cd
--- /dev/null
+++ b/chrome/browser/favicon/chrome_fallback_icon_client_factory.h
@@ -0,0 +1,42 @@
+// 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_FAVICON_CHROME_FALLBACK_ICON_CLIENT_FACTORY_H_
+#define CHROME_BROWSER_FAVICON_CHROME_FALLBACK_ICON_CLIENT_FACTORY_H_
+
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+template <typename T> struct DefaultSingletonTraits;
+
+class FallbackIconClient;
+
+namespace content {
+class BrowserContext;
+}
+
+// Singleton that owns all ChromeFallbackIconClients and associates them with
+// Profiles.
+class ChromeFallbackIconClientFactory
+    : public BrowserContextKeyedServiceFactory {
+ public:
+  // Returns the instance of FallbackIconClient associated with this profile
+  // (creating one if none exists).
+  static FallbackIconClient* GetForBrowserContext(
+      content::BrowserContext* context);
+
+  // Returns an instance of the factory singleton.
+  static ChromeFallbackIconClientFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<ChromeFallbackIconClientFactory>;
+
+  ChromeFallbackIconClientFactory();
+  ~ChromeFallbackIconClientFactory() override;
+
+  // BrowserContextKeyedServiceFactory:
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+};
+
+#endif  // CHROME_BROWSER_FAVICON_CHROME_FALLBACK_ICON_CLIENT_FACTORY_H_
diff --git a/chrome/browser/favicon/fallback_icon_service_factory.cc b/chrome/browser/favicon/fallback_icon_service_factory.cc
new file mode 100644
index 0000000..9c8f465
--- /dev/null
+++ b/chrome/browser/favicon/fallback_icon_service_factory.cc
@@ -0,0 +1,43 @@
+// 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.
+
+#include "chrome/browser/favicon/fallback_icon_service_factory.h"
+
+#include "base/memory/singleton.h"
+#include "chrome/browser/favicon/chrome_fallback_icon_client_factory.h"
+#include "components/favicon/core/fallback_icon_service.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "content/public/browser/browser_context.h"
+
+// static
+FallbackIconService* FallbackIconServiceFactory::GetForBrowserContext(
+    content::BrowserContext* context) {
+  return static_cast<FallbackIconService*>(
+      GetInstance()->GetServiceForBrowserContext(context, true));
+}
+
+// static
+FallbackIconServiceFactory* FallbackIconServiceFactory::GetInstance() {
+  return Singleton<FallbackIconServiceFactory>::get();
+}
+
+FallbackIconServiceFactory::FallbackIconServiceFactory()
+    : BrowserContextKeyedServiceFactory(
+        "FallbackIconService",
+        BrowserContextDependencyManager::GetInstance()) {
+  DependsOn(ChromeFallbackIconClientFactory::GetInstance());
+}
+
+FallbackIconServiceFactory::~FallbackIconServiceFactory() {}
+
+KeyedService* FallbackIconServiceFactory::BuildServiceInstanceFor(
+    content::BrowserContext* context) const {
+  FallbackIconClient* fallback_icon_client =
+      ChromeFallbackIconClientFactory::GetForBrowserContext(context);
+  return new FallbackIconService(fallback_icon_client);
+}
+
+bool FallbackIconServiceFactory::ServiceIsNULLWhileTesting() const {
+  return true;
+}
diff --git a/chrome/browser/favicon/fallback_icon_service_factory.h b/chrome/browser/favicon/fallback_icon_service_factory.h
new file mode 100644
index 0000000..30a3a72
--- /dev/null
+++ b/chrome/browser/favicon/fallback_icon_service_factory.h
@@ -0,0 +1,41 @@
+// 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_FAVICON_FALLBACK_ICON_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_FAVICON_FALLBACK_ICON_SERVICE_FACTORY_H_
+
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+template <typename T> struct DefaultSingletonTraits;
+
+class FallbackIconService;
+
+namespace content {
+class BrowserContext;
+}
+
+// Singleton that owns all FallbackIconService and associates them with
+// BrowserContext instances.
+class FallbackIconServiceFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static FallbackIconService* GetForBrowserContext(
+      content::BrowserContext* context);
+
+  static FallbackIconServiceFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<FallbackIconServiceFactory>;
+
+  FallbackIconServiceFactory();
+  ~FallbackIconServiceFactory() override;
+
+  // BrowserContextKeyedServiceFactory:
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+  bool ServiceIsNULLWhileTesting() const override;
+
+  DISALLOW_COPY_AND_ASSIGN(FallbackIconServiceFactory);
+};
+
+#endif  // CHROME_BROWSER_FAVICON_FALLBACK_ICON_SERVICE_FACTORY_H_
diff --git a/chrome/browser/favicon/favicon_service_factory.h b/chrome/browser/favicon/favicon_service_factory.h
index 36157bb..f62e408 100644
--- a/chrome/browser/favicon/favicon_service_factory.h
+++ b/chrome/browser/favicon/favicon_service_factory.h
@@ -18,7 +18,7 @@ class Profile;
 // Profiles.
 class FaviconServiceFactory : public BrowserContextKeyedServiceFactory {
  public:
-  // |access| defines what the caller plans to do with the service. See
+  // |sat| defines what the caller plans to do with the service. See
   // the ServiceAccessType definition in profile.h.
   static FaviconService* GetForProfile(Profile* profile, ServiceAccessType sat);
 
diff --git a/chrome/browser/search/instant_service.cc b/chrome/browser/search/instant_service.cc
index 818cec9..77b13bc 100644
--- a/chrome/browser/search/instant_service.cc
+++ b/chrome/browser/search/instant_service.cc
@@ -5,6 +5,8 @@
 #include "chrome/browser/search/instant_service.h"
 
 #include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/favicon/fallback_icon_service_factory.h"
+#include "chrome/browser/favicon/favicon_service_factory.h"
 #include "chrome/browser/history/top_sites_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search/instant_io_context.h"
@@ -25,7 +27,10 @@
 #include "chrome/browser/ui/webui/ntp/thumbnail_source.h"
 #include "chrome/browser/ui/webui/theme_source.h"
 #include "chrome/common/render_messages.h"
+#include "components/favicon/core/fallback_icon_service.h"
+#include "components/favicon/core/favicon_service.h"
 #include "components/history/core/browser/top_sites.h"
+#include "components/keyed_service/core/service_access_type.h"
 #include "components/search_engines/template_url_service.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
@@ -126,8 +131,15 @@ InstantService::InstantService(Profile* profile)
   content::URLDataSource::Add(profile_, new ThumbnailListSource(profile_));
 #endif  // !defined(OS_ANDROID)
 
-  content::URLDataSource::Add(profile_, new LargeIconSource(profile));
-  content::URLDataSource::Add(profile_, new FallbackIconSource());
+  FaviconService* favicon_service = FaviconServiceFactory::GetForProfile(
+      profile_, ServiceAccessType::EXPLICIT_ACCESS);
+  FallbackIconService* fallback_icon_service =
+      FallbackIconServiceFactory::GetForBrowserContext(profile_);
+
+  content::URLDataSource::Add(profile_,
+      new LargeIconSource(favicon_service, fallback_icon_service));
+  content::URLDataSource::Add(
+      profile_, new FallbackIconSource(fallback_icon_service));
   content::URLDataSource::Add(
       profile_, new FaviconSource(profile_, FaviconSource::FAVICON));
   content::URLDataSource::Add(profile_, new MostVisitedIframeSource());
diff --git a/chrome/browser/ui/webui/fallback_icon_source.cc b/chrome/browser/ui/webui/fallback_icon_source.cc
index e568b9d..deb5337 100644
--- a/chrome/browser/ui/webui/fallback_icon_source.cc
+++ b/chrome/browser/ui/webui/fallback_icon_source.cc
@@ -4,29 +4,21 @@
 
 #include "chrome/browser/ui/webui/fallback_icon_source.h"
 
-#include <string>
 #include <vector>
 
 #include "base/memory/ref_counted_memory.h"
 #include "chrome/browser/search/instant_io_context.h"
 #include "chrome/common/favicon/fallback_icon_url_parser.h"
 #include "chrome/common/url_constants.h"
-#include "grit/platform_locale_settings.h"
+#include "components/favicon/core/fallback_icon_service.h"
+#include "components/keyed_service/core/service_access_type.h"
 #include "net/url_request/url_request.h"
-#include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/favicon_size.h"
 #include "url/gurl.h"
 
-FallbackIconSource::FallbackIconSource() {
-  std::vector<std::string> font_list;
-#if defined(OS_CHROMEOS)
-  font_list.push_back("Noto Sans");
-#elif defined(OS_IOS)
-  font_list.push_back("Helvetica Neue");
-#else
-  font_list.push_back(l10n_util::GetStringUTF8(IDS_SANS_SERIF_FONT_FAMILY));
-#endif
-  fallback_icon_service_.reset(new FallbackIconService(font_list));
+FallbackIconSource::FallbackIconSource(
+    FallbackIconService* fallback_icon_service)
+    : fallback_icon_service_(fallback_icon_service) {
 }
 
 FallbackIconSource::~FallbackIconSource() {
@@ -47,15 +39,15 @@ void FallbackIconSource::StartDataRequest(
     SendDefaultResponse(callback);
     return;
   }
+
   GURL url(parsed.url_string());
   if (url.is_empty() || !url.is_valid()) {
     SendDefaultResponse(callback);
     return;
   }
-  std::vector<unsigned char> bitmap_data =
-      fallback_icon_service_->RenderFallbackIconBitmap(
-          url, parsed.size_in_pixels(), parsed.style());
-  callback.Run(base::RefCountedBytes::TakeVector(&bitmap_data));
+
+  SendFallbackIconHelper(
+      url, parsed.size_in_pixels(), parsed.style(), callback);
 }
 
 std::string FallbackIconSource::GetMimeType(const std::string&) const {
@@ -77,10 +69,23 @@ bool FallbackIconSource::ShouldServiceRequest(
   return URLDataSource::ShouldServiceRequest(request);
 }
 
-void FallbackIconSource::SendDefaultResponse(
+void FallbackIconSource::SendFallbackIconHelper(
+    const GURL& url,
+    int size_in_pixels,
+    const favicon_base::FallbackIconStyle& style,
     const content::URLDataSource::GotDataCallback& callback) {
+  if (!fallback_icon_service_) {  // Can be null for tests.
+    callback.Run(nullptr);  // Trigger "Not Found" response.
+    return;
+  }
   std::vector<unsigned char> bitmap_data =
       fallback_icon_service_->RenderFallbackIconBitmap(
-          GURL(), gfx::kFaviconSize, favicon_base::FallbackIconStyle());
+          url, size_in_pixels, style);
   callback.Run(base::RefCountedBytes::TakeVector(&bitmap_data));
 }
+
+void FallbackIconSource::SendDefaultResponse(
+    const content::URLDataSource::GotDataCallback& callback) {
+  favicon_base::FallbackIconStyle default_style;
+  SendFallbackIconHelper(GURL(), gfx::kFaviconSize, default_style, callback);
+}
diff --git a/chrome/browser/ui/webui/fallback_icon_source.h b/chrome/browser/ui/webui/fallback_icon_source.h
index acc1d6b..c21fd9b 100644
--- a/chrome/browser/ui/webui/fallback_icon_source.h
+++ b/chrome/browser/ui/webui/fallback_icon_source.h
@@ -5,10 +5,18 @@
 #ifndef CHROME_BROWSER_UI_WEBUI_FALLBACK_ICON_SOURCE_H_
 #define CHROME_BROWSER_UI_WEBUI_FALLBACK_ICON_SOURCE_H_
 
+#include <string>
+
 #include "base/memory/scoped_ptr.h"
-#include "components/favicon/core/fallback_icon_service.h"
 #include "content/public/browser/url_data_source.h"
 
+class FallbackIconService;
+class GURL;
+
+namespace favicon_base {
+struct FallbackIconStyle;
+}
+
 // FallbackIconSource services explicit chrome:// requests for fallback icons.
 //
 // Format:
@@ -41,7 +49,8 @@
 //    32 * 0.5 = 16, and the icon's background shape is a circle.
 class FallbackIconSource : public content::URLDataSource {
  public:
-  FallbackIconSource();
+  // |fallback_icon_service| is owned by caller, and may be null.
+  explicit FallbackIconSource(FallbackIconService* fallback_icon_service);
 
   ~FallbackIconSource() override;
 
@@ -57,11 +66,17 @@ class FallbackIconSource : public content::URLDataSource {
   bool ShouldServiceRequest(const net::URLRequest* request) const override;
 
  private:
+  void SendFallbackIconHelper(
+      const GURL& url,
+      int size_in_pixels,
+      const favicon_base::FallbackIconStyle& style,
+      const content::URLDataSource::GotDataCallback& callback);
+
   // Sends the default fallback icon.
   void SendDefaultResponse(
       const content::URLDataSource::GotDataCallback& callback);
 
-  scoped_ptr<FallbackIconService> fallback_icon_service_;
+  FallbackIconService* fallback_icon_service_;
 
   DISALLOW_COPY_AND_ASSIGN(FallbackIconSource);
 };
diff --git a/chrome/browser/ui/webui/large_icon_source.cc b/chrome/browser/ui/webui/large_icon_source.cc
index e28d342..1c6d0d2 100644
--- a/chrome/browser/ui/webui/large_icon_source.cc
+++ b/chrome/browser/ui/webui/large_icon_source.cc
@@ -4,21 +4,17 @@
 
 #include "chrome/browser/ui/webui/large_icon_source.h"
 
-#include <string>
 #include <vector>
 
 #include "base/memory/ref_counted_memory.h"
-#include "chrome/browser/favicon/favicon_service_factory.h"
-#include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search/instant_io_context.h"
 #include "chrome/common/favicon/large_icon_url_parser.h"
 #include "chrome/common/url_constants.h"
+#include "components/favicon/core/fallback_icon_service.h"
 #include "components/favicon/core/favicon_service.h"
 #include "components/favicon_base/fallback_icon_style.h"
-#include "grit/platform_locale_settings.h"
 #include "net/url_request/url_request.h"
 #include "third_party/skia/include/core/SkColor.h"
-#include "ui/base/l10n/l10n_util.h"
 
 namespace {
 
@@ -42,16 +38,10 @@ LargeIconSource::IconRequest::IconRequest(
 LargeIconSource::IconRequest::~IconRequest() {
 }
 
-LargeIconSource::LargeIconSource(Profile* profile) : profile_(profile) {
-  std::vector<std::string> font_list;
-#if defined(OS_CHROMEOS)
-  font_list.push_back("Noto Sans");
-#elif defined(OS_IOS)
-  font_list.push_back("Helvetica Neue");
-#else
-  font_list.push_back(l10n_util::GetStringUTF8(IDS_SANS_SERIF_FONT_FAMILY));
-#endif
-  fallback_icon_service_.reset(new FallbackIconService(font_list));
+LargeIconSource::LargeIconSource(FaviconService* favicon_service,
+                                 FallbackIconService* fallback_icon_service)
+    : favicon_service_(favicon_service),
+      fallback_icon_service_(fallback_icon_service) {
 }
 
 LargeIconSource::~LargeIconSource() {
@@ -66,17 +56,16 @@ void LargeIconSource::StartDataRequest(
     int render_process_id,
     int render_frame_id,
     const content::URLDataSource::GotDataCallback& callback) {
-  LargeIconUrlParser parser;
-  bool success = parser.Parse(path);
-  if (!success || parser.size_in_pixels() <= 0 ||
-      parser.size_in_pixels() > kMaxLargeIconSize) {
+  if (!favicon_service_) {
     SendNotFoundResponse(callback);
     return;
   }
 
-  FaviconService* favicon_service = FaviconServiceFactory::GetForProfile(
-      profile_, ServiceAccessType::EXPLICIT_ACCESS);
-  if (!favicon_service) {
+  LargeIconUrlParser parser;
+  bool success = parser.Parse(path);
+  if (!success ||
+      parser.size_in_pixels() <= 0 ||
+      parser.size_in_pixels() > kMaxLargeIconSize) {
     SendNotFoundResponse(callback);
     return;
   }
@@ -87,7 +76,7 @@ void LargeIconSource::StartDataRequest(
     return;
   }
 
-  favicon_service->GetRawFaviconForPageURL(
+  favicon_service_->GetRawFaviconForPageURL(
       url,
       favicon_base::TOUCH_ICON | favicon_base::TOUCH_PRECOMPOSED_ICON,
       parser.size_in_pixels(),
@@ -127,6 +116,10 @@ void LargeIconSource::OnIconDataAvailable(
 }
 
 void LargeIconSource::SendFallbackIcon(const IconRequest& request) {
+  if (!fallback_icon_service_) {
+    SendNotFoundResponse(request.callback);
+    return;
+  }
   favicon_base::FallbackIconStyle style;
   style.background_color = SkColorSetRGB(0xcc, 0xcc, 0xcc);
   favicon_base::MatchFallbackIconTextColorAgainstBackgroundColor(&style);
diff --git a/chrome/browser/ui/webui/large_icon_source.h b/chrome/browser/ui/webui/large_icon_source.h
index df3fad6..7fcb825 100644
--- a/chrome/browser/ui/webui/large_icon_source.h
+++ b/chrome/browser/ui/webui/large_icon_source.h
@@ -5,13 +5,16 @@
 #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 "components/favicon_base/favicon_types.h"
 #include "content/public/browser/url_data_source.h"
 
-class Profile;
+class FallbackIconService;
+class FaviconService;
 
 // LargeIconSource services explicit chrome:// requests for large icons.
 //
@@ -28,7 +31,10 @@ class Profile;
 //    This requests a 48x48 large icon for http://www.google.com.
 class LargeIconSource : public content::URLDataSource {
  public:
-  explicit LargeIconSource(Profile* profile);
+  // |favicon_service| and |fallback_icon_service| are owned by caller and may
+  // be null.
+  LargeIconSource(FaviconService* favicon_service,
+                  FallbackIconService* fallback_icon_service);
 
   ~LargeIconSource() override;
 
@@ -69,11 +75,11 @@ class LargeIconSource : public content::URLDataSource {
   void SendNotFoundResponse(
       const content::URLDataSource::GotDataCallback& callback);
 
-  Profile* profile_;
-
   base::CancelableTaskTracker cancelable_task_tracker_;
 
-  scoped_ptr<FallbackIconService> fallback_icon_service_;
+  FaviconService* favicon_service_;
+
+  FallbackIconService* fallback_icon_service_;
 
   DISALLOW_COPY_AND_ASSIGN(LargeIconSource);
 };
diff --git a/chrome/browser/ui/webui/ntp/most_visited_handler.cc b/chrome/browser/ui/webui/ntp/most_visited_handler.cc
index 6b746ebf..e6a90c1 100644
--- a/chrome/browser/ui/webui/ntp/most_visited_handler.cc
+++ b/chrome/browser/ui/webui/ntp/most_visited_handler.cc
@@ -20,6 +20,8 @@
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread.h"
 #include "base/values.h"
+#include "chrome/browser/favicon/fallback_icon_service_factory.h"
+#include "chrome/browser/favicon/favicon_service_factory.h"
 #include "chrome/browser/history/top_sites_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/thumbnails/thumbnail_list_source.h"
@@ -35,8 +37,11 @@
 #include "chrome/browser/ui/webui/ntp/thumbnail_source.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
+#include "components/favicon/core/fallback_icon_service.h"
+#include "components/favicon/core/favicon_service.h"
 #include "components/history/core/browser/page_usage_data.h"
 #include "components/history/core/browser/top_sites.h"
+#include "components/keyed_service/core/service_access_type.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_entry.h"
@@ -81,11 +86,16 @@ void MostVisitedHandler::RegisterMessages() {
   // Set up our sources for top-sites data.
   content::URLDataSource::Add(profile, new ThumbnailListSource(profile));
 
-  // Register chrome://large-icon as a data source for large icons.
-  content::URLDataSource::Add(profile, new LargeIconSource(profile));
+  FaviconService* favicon_service = FaviconServiceFactory::GetForProfile(
+      profile, ServiceAccessType::EXPLICIT_ACCESS);
+  FallbackIconService* fallback_icon_service =
+      FallbackIconServiceFactory::GetForBrowserContext(profile);
 
-  // Register chrome://fallback-icon as a data source for fallback icons.
-  content::URLDataSource::Add(profile, new FallbackIconSource());
+  // Register chrome://large-icon as a data source for large icons.
+  content::URLDataSource::Add(profile,
+      new LargeIconSource(favicon_service, fallback_icon_service));
+  content::URLDataSource::Add(profile,
+                              new FallbackIconSource(fallback_icon_service));
 
   // Register chrome://favicon as a data source for favicons.
   content::URLDataSource::Add(
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 5bfb010..35f13c2 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -1545,10 +1545,16 @@
       'browser/sync_file_system/task_logger.h',
     ],
     'chrome_browser_favicon_sources': [
+      'browser/favicon/chrome_fallback_icon_client.cc',
+      'browser/favicon/chrome_fallback_icon_client.h',
+      'browser/favicon/chrome_fallback_icon_client_factory.cc',
+      'browser/favicon/chrome_fallback_icon_client_factory.h',
       'browser/favicon/chrome_favicon_client.cc',
       'browser/favicon/chrome_favicon_client.h',
       'browser/favicon/chrome_favicon_client_factory.cc',
       'browser/favicon/chrome_favicon_client_factory.h',
+      'browser/favicon/fallback_icon_service_factory.cc',
+      'browser/favicon/fallback_icon_service_factory.h',
       'browser/favicon/favicon_service_factory.cc',
       'browser/favicon/favicon_service_factory.h',
       'browser/favicon/favicon_tab_helper.cc',
diff --git a/chrome/test/base/testing_profile.cc b/chrome/test/base/testing_profile.cc
index 004a73c..d33aeef 100644
--- a/chrome/test/base/testing_profile.cc
+++ b/chrome/test/base/testing_profile.cc
@@ -20,7 +20,9 @@
 #include "chrome/browser/bookmarks/chrome_bookmark_client_factory.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/favicon/chrome_fallback_icon_client_factory.h"
 #include "chrome/browser/favicon/chrome_favicon_client_factory.h"
+#include "chrome/browser/favicon/fallback_icon_service_factory.h"
 #include "chrome/browser/favicon/favicon_service_factory.h"
 #include "chrome/browser/history/chrome_history_client.h"
 #include "chrome/browser/history/chrome_history_client_factory.h"
@@ -54,6 +56,7 @@
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/bookmarks/common/bookmark_constants.h"
 #include "components/content_settings/core/browser/host_content_settings_map.h"
+#include "components/favicon/core/fallback_icon_service.h"
 #include "components/favicon/core/favicon_service.h"
 #include "components/history/content/browser/content_visit_delegate.h"
 #include "components/history/content/browser/history_database_helper.h"
@@ -213,6 +216,12 @@ KeyedService* CreateTestDesktopNotificationService(
 }
 #endif
 
+KeyedService* BuildFallbackIconService(content::BrowserContext* context) {
+  Profile* profile = Profile::FromBrowserContext(context);
+  return new FallbackIconService(
+      ChromeFallbackIconClientFactory::GetForBrowserContext(profile));
+}
+
 KeyedService* BuildFaviconService(content::BrowserContext* context) {
   Profile* profile = Profile::FromBrowserContext(context);
   return new FaviconService(ChromeFaviconClientFactory::GetForProfile(profile),
@@ -570,6 +579,11 @@ TestingProfile::~TestingProfile() {
   }
 }
 
+void TestingProfile::CreateFallbackIconService() {
+  FaviconServiceFactory::GetInstance()->SetTestingFactory(
+      this, BuildFallbackIconService);
+}
+
 void TestingProfile::CreateFaviconService() {
   // It is up to the caller to create the history service if one is needed.
   FaviconServiceFactory::GetInstance()->SetTestingFactory(
diff --git a/chrome/test/base/testing_profile.h b/chrome/test/base/testing_profile.h
index 8db54ee..1cf11c4 100644
--- a/chrome/test/base/testing_profile.h
+++ b/chrome/test/base/testing_profile.h
@@ -6,6 +6,8 @@
 #define CHROME_TEST_BASE_TESTING_PROFILE_H_
 
 #include <string>
+#include <utility>
+#include <vector>
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/ref_counted.h"
@@ -164,6 +166,9 @@ class TestingProfile : public Profile {
 
   ~TestingProfile() override;
 
+  // Creates the fallback icon service.
+  void CreateFallbackIconService();
+
   // Creates the favicon service. Consequent calls would recreate the service.
   void CreateFaviconService();
 
diff --git a/components/favicon.gypi b/components/favicon.gypi
index cddc746..8a9378b 100644
--- a/components/favicon.gypi
+++ b/components/favicon.gypi
@@ -19,6 +19,7 @@
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
+        'favicon/core/fallback_icon_client.h',
         'favicon/core/fallback_icon_service.cc',
         'favicon/core/fallback_icon_service.h',
         'favicon/core/favicon_client.h',
diff --git a/components/favicon/core/BUILD.gn b/components/favicon/core/BUILD.gn
index bbda145..8a4a0f7 100644
--- a/components/favicon/core/BUILD.gn
+++ b/components/favicon/core/BUILD.gn
@@ -4,6 +4,7 @@
 
 static_library("core") {
   sources = [
+    "fallback_icon_client.h",
     "fallback_icon_service.cc",
     "fallback_icon_service.h",
     "favicon_client.h",
diff --git a/components/favicon/core/DEPS b/components/favicon/core/DEPS
index ccb5231..f4dd1e6 100644
--- a/components/favicon/core/DEPS
+++ b/components/favicon/core/DEPS
@@ -2,7 +2,6 @@ include_rules = [
   "+components/bookmarks/browser",
   "+components/history/core/browser",
   "+components/keyed_service/core",
-  "+net/base/registry_controlled_domains/registry_controlled_domain.h",
   "+skia",
   "+third_party/skia",
   "+third_party/skia/include",
diff --git a/components/favicon/core/fallback_icon_client.h b/components/favicon/core/fallback_icon_client.h
new file mode 100644
index 0000000..11bec7a
--- /dev/null
+++ b/components/favicon/core/fallback_icon_client.h
@@ -0,0 +1,30 @@
+// 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 COMPONENTS_FAVICON_CORE_FALLBACK_ICON_CLIENT_H_
+#define COMPONENTS_FAVICON_CORE_FALLBACK_ICON_CLIENT_H_
+
+#include <string>
+#include <vector>
+
+#include "base/strings/string16.h"
+#include "components/keyed_service/core/keyed_service.h"
+
+class GURL;
+
+// This class abstracts operations that depend on the embedder's environment,
+// e.g. Chrome.
+class FallbackIconClient : public KeyedService {
+ public:
+  // Returns a list of font names for fallback icon rendering.
+  virtual const std::vector<std::string>& GetFontNameList() const = 0;
+
+  // Returns the text to render in fallback icon for |url|.
+  virtual base::string16 GetFallbackIconText(const GURL& url) const = 0;
+
+ protected:
+  ~FallbackIconClient() override {}
+};
+
+#endif  // COMPONENTS_FAVICON_CORE_FALLBACK_ICON_CLIENT_H_
diff --git a/components/favicon/core/fallback_icon_service.cc b/components/favicon/core/fallback_icon_service.cc
index e174818..cf7a19b 100644
--- a/components/favicon/core/fallback_icon_service.cc
+++ b/components/favicon/core/fallback_icon_service.cc
@@ -6,10 +6,8 @@
 
 #include <algorithm>
 
-#include "base/i18n/case_conversion.h"
-#include "base/strings/utf_string_conversions.h"
+#include "components/favicon/core/fallback_icon_client.h"
 #include "components/favicon_base/fallback_icon_style.h"
-#include "net/base/registry_controlled_domains/registry_controlled_domain.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/codec/png_codec.h"
@@ -23,21 +21,11 @@ namespace {
 // Arbitrary maximum icon size, can be reasonably increased if needed.
 const int kMaxFallbackFaviconSize = 288;
 
-// Returns a single character to represent a page URL. To do this we take the
-// first letter in a domain's name and make it upper case.
-// TODO(huangs): Handle non-ASCII ("xn--") domain names.
-base::string16 GetFallbackIconText(const GURL& url) {
-  std::string domain = net::registry_controlled_domains::GetDomainAndRegistry(
-        url, net::registry_controlled_domains::INCLUDE_PRIVATE_REGISTRIES);
-  return domain.empty() ? base::string16() :
-      base::i18n::ToUpper(base::ASCIIToUTF16(domain.substr(0, 1)));
-}
-
 }  // namespace
 
 FallbackIconService::FallbackIconService(
-    const std::vector<std::string>& font_list)
-  : font_list_(font_list) {
+    FallbackIconClient* fallback_icon_client)
+    : fallback_icon_client_(fallback_icon_client) {
 }
 
 FallbackIconService::~FallbackIconService() {
@@ -77,17 +65,18 @@ void FallbackIconService::DrawFallbackIcon(
       gfx::Rect(kOffsetX, kOffsetY, size, size), corner_radius, paint);
 
   // Draw text.
-  base::string16 icon_text = GetFallbackIconText(icon_url);
+  base::string16 icon_text =
+      fallback_icon_client_->GetFallbackIconText(icon_url);
   if (icon_text.empty())
     return;
   int font_size = static_cast<int>(size * style.font_size_ratio);
   if (font_size <= 0)
     return;
 
-  // TODO(huangs): See how expensive gfx::FontList() is, and possibly cache.
   canvas->DrawStringRectWithFlags(
       icon_text,
-      gfx::FontList(font_list_, gfx::Font::NORMAL, font_size),
+      gfx::FontList(fallback_icon_client_->GetFontNameList(), gfx::Font::NORMAL,
+                    font_size),
       style.text_color,
       gfx::Rect(kOffsetX, kOffsetY, size, size),
       gfx::Canvas::TEXT_ALIGN_CENTER);
diff --git a/components/favicon/core/fallback_icon_service.h b/components/favicon/core/fallback_icon_service.h
index 9b3f6ba..a1b3e6f 100644
--- a/components/favicon/core/fallback_icon_service.h
+++ b/components/favicon/core/fallback_icon_service.h
@@ -5,11 +5,12 @@
 #ifndef COMPONENTS_FAVICON_CORE_FALLBACK_ICON_SERVICE_H_
 #define COMPONENTS_FAVICON_CORE_FALLBACK_ICON_SERVICE_H_
 
-#include <string>
 #include <vector>
 
 #include "base/macros.h"
+#include "components/keyed_service/core/keyed_service.h"
 
+class FallbackIconClient;
 class GURL;
 
 namespace gfx {
@@ -21,10 +22,10 @@ struct FallbackIconStyle;
 }
 
 // A service to provide methods to render fallback favicons.
-class FallbackIconService {
+class FallbackIconService : public KeyedService {
  public:
-  explicit FallbackIconService(const std::vector<std::string>& font_list);
-  ~FallbackIconService();
+  explicit FallbackIconService(FallbackIconClient* fallback_icon_client);
+  ~FallbackIconService() override;
 
   // Renders a fallback icon synchronously and returns the bitmap. Returns an
   // empty std::vector on failure. |size| is icon width and height in pixels.
@@ -41,7 +42,7 @@ class FallbackIconService {
                         const favicon_base::FallbackIconStyle& style,
                         gfx::Canvas* canvas);
 
-  std::vector<std::string> font_list_;
+  FallbackIconClient* fallback_icon_client_;
 
   DISALLOW_COPY_AND_ASSIGN(FallbackIconService);
 };