[iOS] Create WebStateDelegateTabHelper.

This is the first step to moving the WebStateDelegate implementation
out of BVC.  The only pure virtual function on WebStateDelegate is
OnAuthRequired(), so a no-op implementation is added here.

Bug: 986956
Change-Id: I431142cbadcfe4e7cb4a6a9ce77de4ca11d9bb3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1716165Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680617}

ios/chrome/browser/tabs/tab_helper_util.mm

@@ -60,6 +60,7 @@
 #import "ios/chrome/browser/web/print_tab_helper.h"
 #import "ios/chrome/browser/web/sad_tab_tab_helper.h"
 #import "ios/chrome/browser/web/tab_id_tab_helper.h"
+#import "ios/chrome/browser/web/web_state_delegate_tab_helper.h"
 #import "ios/public/provider/chrome/browser/chrome_browser_provider.h"
 #import "ios/web/public/web_state/web_state.h"
 
@@ -74,6 +75,8 @@ void AttachTabHelpers(web::WebState* web_state, bool for_prerender) {
   // so it needs to be created before them.
   IOSChromeSessionTabHelper::CreateForWebState(web_state);
 
+  WebStateDelegateTabHelper::CreateForWebState(web_state);
+
   NSString* tab_id = TabIdTabHelper::FromWebState(web_state)->tab_id();
   NetworkActivityIndicatorTabHelper::CreateForWebState(web_state, tab_id);
   VoiceSearchNavigationTabHelper::CreateForWebState(web_state);

ios/chrome/browser/web/BUILD.gn

@@ -25,6 +25,8 @@ source_set("web") {
     "sad_tab_tab_helper.mm",
     "web_navigation_util.h",
     "web_navigation_util.mm",
+    "web_state_delegate_tab_helper.h",
+    "web_state_delegate_tab_helper.mm",
   ]
   deps = [
     ":feature_flags",

ios/chrome/browser/web/web_state_delegate_tab_helper.h

+// Copyright 2019 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 IOS_CHROME_BROWSER_WEB_WEB_STATE_DELEGATE_TAB_HELPER_H_
+#define IOS_CHROME_BROWSER_WEB_WEB_STATE_DELEGATE_TAB_HELPER_H_
+
+#import "ios/web/public/web_state/web_state_delegate.h"
+#include "ios/web/public/web_state/web_state_user_data.h"
+
+// Tab helper that handles the WebStateDelegate implementation.
+class WebStateDelegateTabHelper
+    : public web::WebStateDelegate,
+      public web::WebStateUserData<WebStateDelegateTabHelper> {
+ public:
+  ~WebStateDelegateTabHelper() override;
+
+  // TODO(crbug.com/986956): Move remaining WebStateDelegate implementations
+  // into this tab helper.
+
+  // web::WebStateDelegate:
+  void OnAuthRequired(
+      web::WebState* source,
+      NSURLProtectionSpace* protection_space,
+      NSURLCredential* proposed_credential,
+      const web::WebStateDelegate::AuthCallback& callback) override;
+
+ private:
+  explicit WebStateDelegateTabHelper(web::WebState* web_state);
+  friend class web::WebStateUserData<WebStateDelegateTabHelper>;
+  WEB_STATE_USER_DATA_KEY_DECL();
+};
+
+#endif  // IOS_CHROME_BROWSER_WEB_WEB_STATE_DELEGATE_TAB_HELPER_H_

ios/chrome/browser/web/web_state_delegate_tab_helper.mm

+// Copyright 2019 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.
+
+#import "ios/chrome/browser/web/web_state_delegate_tab_helper.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+WEB_STATE_USER_DATA_KEY_IMPL(WebStateDelegateTabHelper)
+
+WebStateDelegateTabHelper::WebStateDelegateTabHelper(web::WebState* web_state) {
+}
+
+WebStateDelegateTabHelper::~WebStateDelegateTabHelper() = default;
+
+void WebStateDelegateTabHelper::OnAuthRequired(
+    web::WebState* source,
+    NSURLProtectionSpace* protection_space,
+    NSURLCredential* proposed_credential,
+    const web::WebStateDelegate::AuthCallback& callback) {
+  AuthCallback local_callback(callback);
+  local_callback.Run(nil, nil);
+  // TODO(crbug.com/980101): Show HTTP authentication dialog using
+  // OverlayPresenter.
+}