Adding JS and C++ handlers for events on new Welcome page.

chrome/browser/ui/webui/welcome_ui.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/welcome_ui.h"
 
 #include "chrome/browser/profiles/profile.h"
-#include "chrome/common/url_constants.h"
+#include "chrome/browser/ui/webui/welcome_handler.h"
 #include "chrome/grit/browser_resources.h"
 #include "chrome/grit/chrome_unscaled_resources.h"
 #include "chrome/grit/chromium_strings.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/web_ui_data_source.h"
+#include "net/base/url_util.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/resources/grit/webui_resources.h"
 
-namespace {
-
-// A URL ending in /1 indicates that we should modify the page to use the
-// "Take Chrome Everywhere" text.
-const char* kEverywhereVariantPath = "/1";
-
-}  // namespace
-
 WelcomeUI::WelcomeUI(content::WebUI* web_ui, const GURL& url)
     : content::WebUIController(web_ui) {
-  // TODO(tmartino): Create WelcomeHandler, and add here.
+  Profile* profile = Profile::FromWebUI(web_ui);
+
+  // This page is not shown to incognito or guest profiles. If one should end up
+  // here, we return, causing a 404-like page.

[michaelpg, 2016/09/27 21:14:12]

Cool, didn't know that. It doesn't trip a DCHECK or anything in Debug builds?

+  if (!profile ||
+      profile->GetProfileType() != Profile::ProfileType::REGULAR_PROFILE) {
+    return;
+  }
+
+  web_ui->AddMessageHandler(new WelcomeHandler(web_ui));
 
   content::WebUIDataSource* html_source =
       content::WebUIDataSource::Create(url.host());
 
   // Check URL for variations.
-  bool is_everywhere_variant = url.path() == kEverywhereVariantPath;
+  std::string value;
+  bool is_everywhere_variant =
+      (net::GetValueForKeyInQuery(url, "variant", &value) &&
+       value == "everywhere");
 
   int header_id = is_everywhere_variant ? IDS_WELCOME_HEADER_AFTER_FIRST_RUN
                                         : IDS_WELCOME_HEADER;
   html_source->AddString("headerText", l10n_util::GetStringUTF16(header_id));
 
 // The subheader describes the browser as being "by Google", so we only show
 // it in the "Welcome to Chrome" variant, and only on branded builds.
 #if defined(GOOGLE_CHROME_BUILD)
   base::string16 subheader =
       is_everywhere_variant ? base::string16()
                             : l10n_util::GetStringUTF16(IDS_WELCOME_SUBHEADER);
   html_source->AddString("subheaderText", subheader);
 #endif
 
   html_source->AddLocalizedString("descriptionText", IDS_WELCOME_DESCRIPTION);
   html_source->AddLocalizedString("acceptText", IDS_WELCOME_ACCEPT_BUTTON);
   html_source->AddLocalizedString("declineText", IDS_WELCOME_DECLINE_BUTTON);
 
   html_source->AddResourcePath("welcome.js", IDR_WELCOME_JS);
   html_source->AddResourcePath("welcome.css", IDR_WELCOME_CSS);
   html_source->AddResourcePath("logo.png", IDR_PRODUCT_LOGO_128);
   html_source->AddResourcePath("logo2x.png", IDR_PRODUCT_LOGO_256);
   html_source->AddResourcePath("watermark.svg", IDR_WEBUI_IMAGES_GOOGLE_LOGO);
   html_source->SetDefaultResource(IDR_WELCOME_HTML);
 
-  Profile* profile = Profile::FromWebUI(web_ui);
   content::WebUIDataSource::Add(profile, html_source);
 }
 
 WelcomeUI::~WelcomeUI() {}