Added experiments section and exported the list of SafeBrowsing features in WebUI

components/safe_browsing/web_ui/safe_browsing_ui.cc

-// Copyright (c) 2017 The Chromium Authors. All rights reserved.
+// Copyright 2017 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/safe_browsing/web_ui/safe_browsing_ui.h"
+
+#include <algorithm>
+#include <utility>
+#include "base/macros.h"
+#include "base/values.h"
 #include "components/grit/components_resources.h"
 #include "components/grit/components_scaled_resources.h"
+#include "components/safe_browsing/features.h"
 #include "components/safe_browsing/web_ui/constants.h"
 #include "components/strings/grit/components_strings.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
-#include "content/public/browser/web_ui_data_source.h"
-
+#include "content/public/browser/web_ui_message_handler.h"
+namespace safe_browsing {
 SafeBrowsingUI::SafeBrowsingUI(content::WebUI* web_ui)
     : content::WebUIController(web_ui) {
   // Set up the chrome://safe-browsing source.
+
   content::WebUIDataSource* html_source = content::WebUIDataSource::Create(
       safe_browsing::kChromeUISafeBrowsingHost);
 
+  // Register callback handler.
+  // Handles messages from JavaScript to C++ via chrome.send().
+  web_ui->AddMessageHandler(base::MakeUnique<SafeBrowsingUIHandler>());
+
   // Add localized string resources.
   html_source->AddLocalizedString("sbUnderConstruction",
                                   IDS_SB_UNDER_CONSTRUCTION);
 
   // Add required resources.
   html_source->AddResourcePath("safe_browsing.css", IDR_SAFE_BROWSING_CSS);
+  html_source->AddResourcePath("safe_browsing.js", IDR_SAFE_BROWSING_JS);
   html_source->SetDefaultResource(IDR_SAFE_BROWSING_HTML);
 
   content::BrowserContext* browser_context =
       web_ui->GetWebContents()->GetBrowserContext();
   content::WebUIDataSource::Add(browser_context, html_source);
 }
 
 SafeBrowsingUI::~SafeBrowsingUI() {}
+
+SafeBrowsingUIHandler::SafeBrowsingUIHandler(){};
+
+void SafeBrowsingUIHandler::ExpParamList(const base::ListValue* unused) {
+  AllowJavascript();
+  CallJavascriptFunction("safe_browsing.addExperiment", GetFeatureStatusList());
+}
+
+void SafeBrowsingUIHandler::RegisterMessages() {
+  web_ui()->RegisterMessageCallback(
+      "expParamList",
+      base::Bind(&SafeBrowsingUIHandler::ExpParamList, base::Unretained(this)));
+}
+
+SafeBrowsingUIHandler::~SafeBrowsingUIHandler() {}
+}  // namespace safe_browsing