Refactor creation of SadTabView into a tab helper object

ios/web/public/test/fakes/test_web_state.mm

 // Copyright 2014 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/web/public/test/fakes/test_web_state.h"
 
 #include <stdint.h>
 
 #include "base/callback.h"
 #include "ios/web/public/web_state/web_state_observer.h"
 
 namespace web {
 
 void TestWebState::AddObserver(WebStateObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void TestWebState::RemoveObserver(WebStateObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 TestWebState::TestWebState()
     : browser_state_(nullptr),
       web_usage_enabled_(false),
       is_loading_(false),
+      is_showing_transient_content_view_(false),
       trust_level_(kAbsolute),
       content_is_html_(true) {}
 
 TestWebState::~TestWebState() {
   for (auto& observer : observers_)
     observer.WebStateDestroyed();
   for (auto& observer : observers_)
     observer.ResetWebState();
 };
 
@@ skipping 133 matching lines @@
     PageLoadCompletionStatus load_completion_status) {
   for (auto& observer : observers_)
     observer.PageLoaded(load_completion_status);
 }
 
 void TestWebState::OnProvisionalNavigationStarted(const GURL& url) {
   for (auto& observer : observers_)
     observer.ProvisionalNavigationStarted(url);
 }
 
+void TestWebState::OnRenderProcessGone() {
+  for (auto& observer : observers_)
+    observer.RenderProcessGone();
+}
+
+void TestWebState::ShowTransientContentView(CRWContentView* content_view) {
+  if (content_view) {
+    is_showing_transient_content_view_ = true;

[Eugene But (OOO till 7-30), 2017/04/12 17:40:08]

Do you want to set this to false in ClearTransientContentView?

[peterlaurens, 2017/04/12 18:00:53]

Yes! Great idea, thanks!

+  }
+}
+
 void TestWebState::SetCurrentURL(const GURL& url) {
   url_ = url;
 }
 
 void TestWebState::SetTrustLevel(URLVerificationTrustLevel trust_level) {
   trust_level_ = trust_level;
 }
 
 CRWWebViewProxyType TestWebState::GetWebViewProxy() const {
   return nullptr;
 }
 
 service_manager::InterfaceRegistry* TestWebState::GetMojoInterfaceRegistry() {
   return nullptr;
 }
 
 bool TestWebState::HasOpener() const {
   return false;
 }
 
 base::WeakPtr<WebState> TestWebState::AsWeakPtr() {
   NOTREACHED();
   return base::WeakPtr<WebState>();
 }
 
+bool TestWebState::IsShowingTransientContentView() {
+  return is_showing_transient_content_view_;
+}
+
 }  // namespace web