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

chrome/browser/ui/webui/snippets_internals_message_handler.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 "chrome/browser/ui/webui/snippets_internals_message_handler.h"
 
 #include <memory>
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/feature_list.h"
 #include "base/i18n/time_formatting.h"
-#include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
-#include "base/strings/string_piece.h"
 #include "base/strings/string_split.h"
 #include "base/values.h"
 #include "chrome/browser/android/chrome_feature_list.h"
 #include "chrome/browser/ntp_snippets/ntp_snippets_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/ntp_snippets/ntp_snippet.h"
-#include "components/ntp_snippets/pref_names.h"
 #include "components/ntp_snippets/switches.h"
-#include "components/prefs/pref_service.h"
 #include "content/public/browser/web_ui.h"
 
 namespace {
 
 std::unique_ptr<base::DictionaryValue> PrepareSnippet(
     const ntp_snippets::NTPSnippet& snippet,
     int index,
     bool discarded) {
   std::unique_ptr<base::DictionaryValue> entry(new base::DictionaryValue);
   entry->SetString("snippetId", snippet.id());
@@ skipping 50 matching lines @@
   web_ui()->RegisterMessageCallback(
       "loaded",
       base::Bind(&SnippetsInternalsMessageHandler::HandleLoaded,
                  base::Unretained(this)));
 
   web_ui()->RegisterMessageCallback(
       "clear", base::Bind(&SnippetsInternalsMessageHandler::HandleClear,
                           base::Unretained(this)));
 
   web_ui()->RegisterMessageCallback(
-      "dump", base::Bind(&SnippetsInternalsMessageHandler::HandleDump,
-                         base::Unretained(this)));
-
-  web_ui()->RegisterMessageCallback(
       "download", base::Bind(&SnippetsInternalsMessageHandler::HandleDownload,
                              base::Unretained(this)));
 
   web_ui()->RegisterMessageCallback(
       "clearDiscarded",
       base::Bind(&SnippetsInternalsMessageHandler::HandleClearDiscarded,
                  base::Unretained(this)));
 }
 
 void SnippetsInternalsMessageHandler::HandleLoaded(
     const base::ListValue* args) {
   DCHECK_EQ(0u, args->GetSize());
 
   dom_loaded_ = true;
 
   SendInitialData();
 }
 
 void SnippetsInternalsMessageHandler::HandleClear(const base::ListValue* args) {
   DCHECK_EQ(0u, args->GetSize());
 
   ntp_snippets_service_->ClearSnippets();
 }
 
-void SnippetsInternalsMessageHandler::HandleDump(const base::ListValue* args) {
-  DCHECK_EQ(0u, args->GetSize());
-
-  PrefService* pref_service = Profile::FromWebUI(web_ui())->GetPrefs();
-
-  std::string json;
-  base::JSONWriter::Write(
-      *pref_service->GetList(ntp_snippets::prefs::kSnippets), &json);
-
-  SendJson(json);
-}
-
 void SnippetsInternalsMessageHandler::HandleClearDiscarded(
     const base::ListValue* args) {
   DCHECK_EQ(0u, args->GetSize());
 
   ntp_snippets_service_->ClearDiscardedSnippets();
   SendDiscardedSnippets();
 }
 
 void SnippetsInternalsMessageHandler::HandleDownload(
     const base::ListValue* args) {
@@ skipping 82 matching lines @@
 
     hosts_list->Append(std::move(entry));
   }
 
   base::DictionaryValue result;
   result.Set("list", std::move(hosts_list));
   web_ui()->CallJavascriptFunction("chrome.SnippetsInternals.receiveHosts",
                                    result);
 }
 
-void SnippetsInternalsMessageHandler::SendJson(const std::string& json) {
-  web_ui()->CallJavascriptFunction(
-      "chrome.SnippetsInternals.receiveJsonToDownload",
-      base::StringValue(json));
-}
-
 void SnippetsInternalsMessageHandler::SendBoolean(const std::string& name,
                                                   bool value) {
   SendString(name, value ? "True" : "False");
 }
 
 void SnippetsInternalsMessageHandler::SendString(const std::string& name,
                                                  const std::string& value) {
   base::StringValue string_name(name);
   base::StringValue string_value(value);
 
   web_ui()->CallJavascriptFunction("chrome.SnippetsInternals.receiveProperty",
                                    string_name, string_value);
 }