[NTP Snippets] Persist snippets in a LevelDB instead of prefs

chrome/browser/ntp_snippets/ntp_snippets_service_factory.cc

Index: chrome/browser/ntp_snippets/ntp_snippets_service_factory.cc
diff --git a/chrome/browser/ntp_snippets/ntp_snippets_service_factory.cc b/chrome/browser/ntp_snippets/ntp_snippets_service_factory.cc
index 17dbfc27177760cb259731f356b7922c19a899d0..36104bb435feb751e8f15ad49e47791d7b3a7965 100644
--- a/chrome/browser/ntp_snippets/ntp_snippets_service_factory.cc
+++ b/chrome/browser/ntp_snippets/ntp_snippets_service_factory.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/ntp_snippets/ntp_snippets_service_factory.h"
 
+#include "base/files/file_path.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
 #include "chrome/browser/browser_process.h"
@@ -17,6 +18,7 @@
 #include "components/browser_sync/browser/profile_sync_service.h"
 #include "components/image_fetcher/image_fetcher.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "components/ntp_snippets/ntp_snippets_database.h"
 #include "components/ntp_snippets/ntp_snippets_fetcher.h"
 #include "components/ntp_snippets/ntp_snippets_scheduler.h"
 #include "components/ntp_snippets/ntp_snippets_service.h"
@@ -83,6 +85,8 @@ KeyedService* NTPSnippetsServiceFactory::BuildServiceInstanceFor(
   scheduler = NTPSnippetsLauncher::Get();
 #endif  // OS_ANDROID
 
+  base::FilePath database_dir(
+      profile->GetPath().Append(FILE_PATH_LITERAL("NTPSnippets")));
   scoped_refptr<base::SequencedTaskRunner> task_runner =
       BrowserThread::GetBlockingPool()
           ->GetSequencedTaskRunnerWithShutdownBehavior(
@@ -90,11 +94,13 @@ KeyedService* NTPSnippetsServiceFactory::BuildServiceInstanceFor(
               base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN);
 
   return new ntp_snippets::NTPSnippetsService(
-      profile->GetPrefs(), sync_service, suggestions_service, task_runner,
+      profile->GetPrefs(), sync_service, suggestions_service,
       g_browser_process->GetApplicationLocale(), scheduler,
       base::WrapUnique(new ntp_snippets::NTPSnippetsFetcher(
           signin_manager, token_service, request_context,
           base::Bind(&safe_json::SafeJsonParser::Parse),
           chrome::GetChannel() == version_info::Channel::STABLE)),
-      base::WrapUnique(new ImageFetcherImpl(request_context.get())));
+      base::WrapUnique(new ImageFetcherImpl(request_context.get())),
+      base::WrapUnique(
+          new ntp_snippets::NTPSnippetsDatabase(database_dir, task_runner)));
 }