Add public API for handling Javascript alerts and prompt.

ios/web/web_state/web_state_impl.mm

 // Copyright 2013 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 "ios/web/web_state/web_state_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/strings/sys_string_conversions.h"
 #include "ios/web/interstitials/web_interstitial_impl.h"
 #import "ios/web/navigation/crw_session_controller.h"
 #import "ios/web/navigation/crw_session_entry.h"
 #include "ios/web/navigation/navigation_item_impl.h"
 #include "ios/web/net/request_group_util.h"
 #include "ios/web/public/browser_state.h"
+#include "ios/web/public/dialog_presenter.h"
 #include "ios/web/public/navigation_item.h"
 #include "ios/web/public/url_util.h"
 #include "ios/web/public/web_client.h"
 #import "ios/web/public/web_state/context_menu_params.h"
 #include "ios/web/public/web_state/credential.h"
 #include "ios/web/public/web_state/ui/crw_content_view.h"
 #include "ios/web/public/web_state/web_state_delegate.h"
 #include "ios/web/public/web_state/web_state_observer.h"
 #include "ios/web/public/web_state/web_state_policy_decider.h"
 #include "ios/web/web_state/global_web_state_event_tracker.h"
@@ skipping 395 matching lines @@
   }
 }
 
 bool WebStateImpl::HandleContextMenu(const web::ContextMenuParams& params) {
   if (delegate_) {
     return delegate_->HandleContextMenu(this, params);
   }
   return false;
 }
 
+void WebStateImpl::RunJavaScriptDialog(
+    const GURL& origin_url,
+    JavaScriptMessageType javascript_message_type,
+    NSString* message_text,
+    NSString* default_prompt_text,
+    const DialogClosedCallback& callback) {
+  if (!delegate_) {
+    callback.Run(false, nil);
+    return;
+  }
+  DialogPresenter* presenter = delegate_->GetDialogPresenter(this);
+  if (presenter) {
+    presenter->RunJavaScriptDialog(this, origin_url, javascript_message_type,
+                                   message_text, default_prompt_text, callback);
+  }

[Eugene But (OOO till 7-30), 2016/06/24 17:04:53]

I would expect a crash if GetDialogPresenter returns nil. Should this code be
like this:

DialogPresenter* presenter = delegate_ ? delegate_->GetDialogPresenter(this) :
nullptr;
if (!presenter) {
  callback.Run(false, nil);
  return;
}

presenter->RunJavaScriptDialog(this, origin_url, javascript_message_type,
message_text, default_prompt_text, callback);

[michaeldo, 2016/06/27 20:30:10]

Done.

+}
+
+void WebStateImpl::RunAuthDialog(NSURLProtectionSpace* protectionSpace,
+                                 NSURLCredential* credential,
+                                 const AuthDialogCallback& callback) {
+  if (!delegate_) {
+    callback.Run(net::AuthCredentials());
+    return;
+  }
+  DialogPresenter* presenter = delegate_->GetDialogPresenter(this);
+  if (presenter) {
+    presenter->RunAuthDialog(this, protectionSpace, credential, callback);
+  }
+}
+
+void WebStateImpl::CancelActiveAndPendingDialogs() {
+  if (delegate_) {
+    DialogPresenter* presenter = delegate_->GetDialogPresenter(this);
+    if (presenter) {
+      presenter->CancelActiveAndPendingDialogs(this);
+    }
+  }
+}
+
 WebUIIOS* WebStateImpl::CreateWebUIIOS(const GURL& url) {
   WebUIIOSControllerFactory* factory =
       WebUIIOSControllerFactoryRegistry::GetInstance();
   if (!factory)
     return NULL;
   WebUIIOSImpl* web_ui = new WebUIIOSImpl(this);
   WebUIIOSController* controller =
       factory->CreateWebUIIOSControllerForURL(web_ui, url);
   if (controller) {
     web_ui->SetController(controller);
@@ skipping 221 matching lines @@
     const LoadCommittedDetails& load_details) {
   FOR_EACH_OBSERVER(WebStateObserver, observers_,
                     NavigationItemCommitted(load_details));
 }
 
 WebState* WebStateImpl::GetWebState() {
   return this;
 }
 
 }  // namespace web